Door magnet fit checker

Custom Car Door Magnets: Check Your Door Fit

Check steel contact, door geometry, route, and care before ordering. Get a preliminary result and a copyable sample-request summary.

First recorded 2026/03/08Last updated 2026/10/27Sources reviewed: 2026-10-27

Prepared by Ganzhou Magnets. This is a sourcing checklist based on the cited guidance, not a physical retention test.

Enable JavaScript to run the fit checker, or email door photos, dimensions, sign count, route, and care details for manual sample and placement review. This page does not approve retention or a safe speed.

1) Check your door and route

Example inputs below. Replace them with your actual conditions; all fields are required.

Input panel

Result and next action

No result yet.

Submit the checker to get a preliminary rule-based fit band, pressure context, and required next actions.

Wind load cue (dynamic pressure trend)

At 55 mph, the equation gives dynamic pressure near 370 Pa. This pressure trend does not measure force on the sign or verify its actual retention margin.

2) Core conclusions and decision signal

These are the decision statements to align procurement, operations, and installer teams before RFQ lock.

Conclusion

Door geometry is a hard placement gate

Avoid seams, moldings, and recessed body lines

Magnum guidance calls for smooth/flat or gently curved metal contact and warns against protrusions or recessed areas, which raises edge-lift risk on many door contours.

Conclusion

Leased and rental CMVs add a legal branch

Up to 30 calendar days; vehicle and document conditions apply

49 CFR 390.21T(e) distinguishes rented CMVs and leased passenger-carrying CMVs; a short term alone does not satisfy its marking and documentation conditions.

Conclusion

Highway escalation remains non-linear

75 mph is ~1.86x dynamic pressure vs 55 mph

NASA gives the pressure equation. The ratio assumes equal air density and does not establish sign force, detach probability, or a safe speed.

Conclusion

Fallback media needs its own specification

Color-change wrap is a reference, not a printed-logo specification

3M 2080 illustrates adhesive vehicle decoration. Have an installer confirm the exact printed or color-change film, substrate, finish, removal method, and price.

Conclusion

Daily care is an operating requirement

Remove, clean, dry, and inspect daily

The cited vehicle-sign care guidance calls for daily cleaning. Confirm the exact media instructions and assign an owner before rollout.

Sources for the conclusions (reviewed 2026-10-27)

Conclusion	Source	Date	Boundary note
Door magnets need smooth contact and should avoid protrusions/recesses	Magnum Magnetics Clean & Care	Accessed 2026-10-27	Primary manufacturer guidance; equivalent products still require vendor-specific datasheet confirmation.
Short-term rental CMV marking path is conditional	49 CFR 390.21T(e) (eCFR current)	eCFR through 2026-10-23; checked 2026-10-27	Applies to CMVs in FMCSA scope and depends on rental-term/document controls.
75 mph aerodynamic demand vs 55 mph baseline	NASA Glenn: Dynamic pressure	Accessed 2026-10-27	Equation gives trend/ratio, but real-route turbulence and install quality still require pilots.
Adhesive vehicle-wrap alternative needs installer review	3M Wrap Film 2080 technical properties	Accessed 2026-10-27	Product-page properties are SKU-level; always verify final media spec and warranty zone with installer.

3) Key numbers snapshot

Reference numbers used in this page, each with a direct implication for go/no-go decisions.

Metric	Value	Why it matters
Vehicle-sign care	Daily removal and cleaning	Magnum manufacturer guidance; confirm the exact media instructions and assign a daily owner.
Installation baseline for the magnet itself	At least 60°F (16°C)	Manufacturer guidance for application; not a vehicle operating-speed rating.
Temperature exclusions in cited care guidance	Below −15°F (−26°C) or above 160°F (71°C)	Product-specific limits; the checker does not measure actual panel or sign temperature.
Exact media retention and price	Unknown until supplier review	30 mil is a quote baseline. Thickness, area, and pressure do not establish retention, service life, or installed cost.
Door placement geometry boundary	Smooth contact only; avoid moldings/decals/recessed body lines	Interrupted door geometry creates air gaps and corner lift even when area and speed look acceptable.
Dynamic pressure delta: 75 mph vs 55 mph	~+86% dynamic pressure (1.86x)	At equal air density; actual sign force and retention remain unmeasured. No safe-speed threshold follows from this ratio.
Short-term rental CMV marking branch	Up to 30 calendar days; rented CMVs / leased passenger-carrying CMVs (49 CFR 390.21T(e))	Leased/rental programs can fail legal checks if operating-carrier identity and paperwork path are not explicit.
Fallback wrap reference (3M 2080)	Color-change wrap; installer approval required	The reference product is not a universal printable-logo film or a guarantee for every substrate. Confirm exact film, finish, removal process, and quote.

Prepare a sample request

Need a quote-ready decision now? Share door-zone photos, rental/leased fleet status, and top-speed lanes so we can close geometry and compliance controls before artwork lock.

[email protected]

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4) Suitable vs unsuitable buyer profile

Use this split to route the page visitor toward magnets, pilot mode, or fallback media without ambiguity.

Best fit users

Local or regional fleets that can verify steel door zones
Teams needing fast campaign swaps without adhesive downtime
Operations with documented handling and cleaning ownership

Not ideal users

Highway-dominant fleets with mixed-material vehicle bodies
Programs expecting multi-year no-maintenance branding
Teams without owner accountability for remove-clean routines

5) Method and calculation logic

This preliminary screen applies fixed rules to sign size, speed, panel, and care inputs. Its classification is not calibrated against retention tests or a field-failure dataset.

Custom car door magnets checker holds installation when full door contact is unverified — Software capture, 2026-10-27: 24 × 18 in, 55 mph, 6 months, 50 signs, flat steel, rain/snow, moderate UV, twice-weekly care, multicolor design, vertical placement, promo-only use, 30 mil media, and unverified contact. The result holds installation. This demonstrates the checklist, not a physical test or customer outcome. Site navigation and sticky controls were hidden for this result-card capture.

Step 1: Input normalization

Convert dimensions to area, speed to dynamic pressure trend, and handling cadence to maintenance burden.

Step 2: Checklist review

Check material, full contact, and finish first. Then flag non-daily care, undocumented media, route speed above the editorial 55 mph review trigger, and unresolved CMV/rental conditions. No statistically calibrated weights are used.

Step 3: Boundary gating

Hold installation for any non-steel/unknown material, unverified/interrupted contact, or unsupported finish/orientation at every speed. Even a complete checklist still requires supplier and pilot validation.

Step 4: Action output

Return a preliminary rule-based band, pressure context, and required pilot actions. The band is not a probability or approval to install.

6) Evidence layer and source register

Every critical claim is tied to a source and date marker. Unknowns are treated explicitly instead of hidden by generic copy.

Source	Signal used	Date
49 CFR 390.5T (current CMV definition)	The current eCFR definition includes the 10,001 lb interstate weight threshold plus passenger-count and hazardous-material cases. Confirm scope per vehicle with a fleet compliance owner.	eCFR checked 2026-10-27
49 CFR 393.9 (lamps and reflective-device obstructions)	Section 393.9(b) says required lamps and reflective devices/material must not be obscured by added vehicle or work equipment.	eCFR checked 2026-10-27
49 CFR 392.33 (obscured lamps or reflective devices/material)	Section 392.33(a) prohibits driving a CMV when required lamps or reflective devices/material are obscured by added vehicle or work equipment.	eCFR checked 2026-10-27
Magnum Magnetics Clean & Care	Smooth full-contact steel only; exclude trim/recesses, aluminum/plastic, and repainted zones. Install the magnet at 60°F or above; remove and clean vehicle signs daily.	Accessed 2026-10-27
49 CFR 390.21T (Marking of self-propelled CMVs)	CMV IDs must appear on both sides, stay legible from 50 ft in daylight, and removable devices are allowed only if legibility and maintenance requirements remain satisfied.	eCFR through 2026-10-23; checked 2026-10-27
FMCSA guidance Q001 (2+ carrier markings)	If multiple carrier names appear, the operating motor carrier must be identified with the words "operated by."	Issued 1997-04-04, accessed 2026-10-27
NASA Glenn dynamic pressure reference	q = 1/2 * rho * v^2; 75 mph dynamic pressure is about 1.86x that at 55 mph under identical air-density assumptions.	Accessed 2026-10-27
3M Wrap Film 2080 technical properties	2080 is a color-change vehicle film; the published warranty has exposure-dependent limits. Confirm the exact substrate and use with an authorized installer; it is not a generic printable-logo specification.	Accessed 2026-10-27

Decision controls and evidence limits

Decision question	Evidence and decision control	Evidence tier	Boundary / counterexample	Minimum executable control
Door-panel fit advice lacked geometry-level exclusions.	Added manufacturer-backed geometry boundary: avoid moldings, decals, and recessed body lines; require full-surface contact without air pockets.	Primary manufacturer care guidance	Vendor guidance is not a universal failure-rate dataset. Equivalent media still needs product-specific documentation.	Approve print only after door-zone photos confirm flat contact envelope per vehicle class.
Leased/rental CMV door-marking path was not explicit.	Added 49 CFR 390.21T(e) branch for <=30-day rentals and linked "operated by" guidance for multi-name vehicles.	Regulatory text + FMCSA guidance	Applies in FMCSA scope and depends on rental-term/document controls; passenger fleets can fall under different state/local rules.	Separate legal-ID ownership from promo-door graphics and carry rental-agreement proof where required.
High-speed boundary used 65 mph examples but not interstate extremes.	Added explicit 75 mph vs 55 mph dynamic-pressure ratio (~1.86x) to show non-linear risk escalation for door magnets.	First-principles physics model	Formula does not model turbulence spikes, worn edges, or imperfect install geometry.	Run route pilot on highest sustained-speed lanes before fleet-wide door deployment.
Fallback to wrap/decal lacked substrate-level evidence.	Linked the 3M 2080 vehicle decoration reference, with explicit limits: exact film, substrate, printed artwork compatibility, removal, and warranty need installer confirmation.	Primary manufacturer technical properties	This is a product-family property summary, not a full lifecycle cost benchmark for every fleet.	When steel hold fails, trigger media-switch review instead of forcing magnet-only rollout.
Door-seam detach benchmark remained unquantified in public data.	Kept explicit pending status: no reliable public benchmark normalizes detach rate by seam depth x speed lane x vehicle class.	Pending confirmation / public-evidence gap	Do not claim universal detach thresholds from anecdotal fleet stories.	Capture internal pilot detach and edge-lift logs for 30-90 days before scaling.

7) Regulatory applicability and compliance gates

Commercial fleet projects can fail after a good fit score if legal marking or conspicuity constraints are ignored. This matrix separates operational fit from legal fit.

Trigger	Requirement signal	Applies when	Magnet-specific risk	Minimum control
CMV applicability threshold	49 CFR 390.5T includes an interstate 10,001 lb vehicle/combination-weight category, with separate passenger-count and hazardous-material categories also in the definition.	Commercial fleets only; many passenger vehicles are out of FMCSA scope but still subject to state laws.	Teams assume all vehicles follow the same rule set and miss where federal marking/conspicuity rules begin.	Classify each vehicle by regulation scope during intake (CMV vs non-CMV) before artwork lock.
Company/USDOT marking visibility	49 CFR 390.21T requires both-side markings that contrast sharply and are legible from 50 ft in daylight.	Interstate CMVs displaying legal identifiers, including removable marking methods.	If a removable magnet carries legal IDs and slips, curls, or gets removed, compliance can fail mid-route.	Keep legal IDs off optional promo magnets or add pre-dispatch legibility checks with owner sign-off.
No obscured required lighting/reflectors	49 CFR 393.9(b) says lamps and reflective devices/material required by its subpart must not be obscured; 49 CFR 392.33(a) prohibits driving a CMV while those required devices are obscured.	Any CMV where magnet placement can overlap lamps, reflective tape, or mandated reflectors.	Large promotional magnets can partially cover required visibility hardware on vans/trailers.	Use placement templates with “no-cover zones” and confirm clearances in install photos.

Placement, compliance, and pilot controls

Decision gate	Go when	No-go when	Proof to collect	Fallback path
Door geometry contact envelope	Planned door zones are smooth/flat or gently curved steel with no moldings, badges, or recessed breaks crossing the magnet footprint.	Placement crosses protrusions/recessed lines or leaves visible air pockets after install.	Door-zone photos + post-install full-contact check for each vehicle type.	Reduce magnet footprint or shift to wrap/decal media on geometry-conflicted zones.
Panel material verification	Every target door zone is confirmed ferromagnetic steel with hold-test evidence.	Door skins are mixed with aluminum/plastic composites or material remains unknown.	Panel map + zone-by-zone magnet hold test records.	Use adhesive media for non-steel zones and keep magnets only on verified steel doors.
CMV marking ownership and rental branch	CMV scope is confirmed, legal IDs remain compliant, and short-term rental paperwork path is documented where used.	Multiple carrier names appear without operating-carrier precedence or rental agreements lack required details.	Compliance checklist citing 49 CFR 390.21T plus dispatch packet sample for rental/leased units.	Keep mandatory IDs on durable markings; use door magnets for campaign content only.
Speed-lane durability control	Pilot shows stable hold on highest sustained-speed lanes with no repeated corner lift.	Interstate lanes (for example around 75 mph) show repeat edge lift, detach, or rapid corner memory.	Pilot log with speed/weather lane records and post-shift door inspections.	Move high-speed corridors to wrap/decal baseline and reserve magnets for low-speed temporary windows.
Operations ownership and maintenance cadence	Named owner executes remove-clean-dry cadence and tracks exceptions each week.	Magnets remain installed for long periods without inspection or cleaning accountability.	SOP card + first-month maintenance logs by vehicle.	Adopt lower-maintenance media when operational cadence cannot be sustained.

Reviewed 2026-10-27: manufacturer care guidance, NASA pressure method, US CMV marking text, and wrap limitations. The checklist has no calibrated detach-rate dataset; exact media retention, local legal scope, and installed cost remain subject to supplier, fleet, and pilot confirmation.

8) Option comparison (magnets vs alternatives)

Use this table when campaign duration, panel compatibility, or operations discipline suggest a different medium.

Option	Setup	Removal	Panel dependency	Durability window	Risk profile	Best use
Custom car magnets	Fast deployment; no adhesive curing	High (designed for repeated removal)	Requires ferromagnetic steel panels	Use-condition dependent; cleaning cadence is decisive	Edge lift, moisture trap, fly-off if handling weak	Short campaigns, fleet swaps, temporary branding
Spot vinyl decals	Moderate install with surface prep	Medium (adhesive removal effort required)	Installer must confirm the exact finish and substrate	Product and exposure dependent; no universal comparison verified	Adhesive residue, paint sensitivity on removal	Semi-permanent branding with low daily handling
Full/partial wrap film	Longest install; professional application preferred	Medium with trained removal process	Broad panel compatibility	3M guidance: up to 8 years vertical / up to 3 years horizontal	Higher upfront cost and removal planning complexity	Long-horizon brand programs with stable vehicle roster

Counterexamples and limit-condition cases

Case	Why baseline output can mislead	What breaks first	Minimum decision action
Fresh repaint or new clear coat on door panel	The checker cannot inspect the finish; the finish selector must be verified against supplier guidance.	Finish risk rises if magnets are installed before cure windows (manufacturer guidance: ~90 days paint, 60 days clear coat).	The cited care guidance excludes repainted surfaces. Cure timing does not override that exclusion; review an alternative with the supplier.
CMV legal identifier mounted on removable magnet	Tool evaluates hold and maintenance, not legal-readability continuity during dispatch changes.	A removed or damaged magnet can break 50 ft legibility or two-side identifier expectations for regulated vehicles.	Use permanent legal markings and keep campaign magnets separate from mandatory ID content.
Passenger-vehicle state-law placement edge cases	No unified public US dataset fully normalizes state-level restrictions for private vehicle sign placement.	A design that is operationally stable can still hit local placement or visibility constraints.	Mark as pending review: confirm state/local rules before scaling to multi-state fleets.
Door magnet spans a body molding or recessed character line	A nominal fit score can pass even though the contact surface is interrupted by geometry that the model does not directly parse.	Local air gaps form at the contour transition, accelerating corner lift and detach risk at speed.	Treat as conditional/no-go until footprint is resized or moved to a full-contact steel zone.
Short-term rental CMV uses removable door IDs without agreement controls	Physics fit can be acceptable while legal marking documentation path is incomplete.	Fleet can fail roadside marking checks when operating-carrier identity is not clear in rental/leased workflows.	Confirm 49 CFR 390.21T(e) documentation path or keep legal identifiers on permanent compliant layers.

9) Boundaries, known limits, and unknowns

Trust the result only inside these boundaries. If inputs cross the line, use the fallback action instead of stretching assumptions.

Boundary condition	Trust result when	Watch out when	Fallback action
Panel material certainty	Steel panel map confirmed before print approval	Unknown panel mix on newer vehicles	Run steel-only placement template or shift to decal/wrap
Route speed profile	Supplier-reviewed media and a controlled pilot on the intended route	No speed alone establishes safe retention, including routes at or below 55 mph	Pilot at real route speed or switch media
Handling discipline	Documented cleaning and reapplication routine	Magnets left in place for long intervals	Assign owner + checklist or avoid magnet route
Weather / UV stress	Moderate UV and non-coastal duty	High UV + salt + winter slush cycles	Laminate upgrade + shorter refresh cycle + stricter checks
Regulatory visibility constraints (CMV lanes)	Legal IDs and required reflective/lighting zones are isolated from removable promo magnets	Magnets are used as mandatory identifiers or placed near conspicuity hardware	Split legal markings from campaign graphics and lock no-cover placement templates

Known unknown register

Unknown item	Current status	Impact	Minimum next step
Exact steel coverage by model year and trim	Unknown at quote intake for many fleets	Incorrect media choice and higher failure risk	Collect panel map photos or run magnet hold test per body zone
Real cleaning behavior by operators	Often untracked after deployment	Moisture trapping, paint haze, edge lift	Assign owner, add weekly log, include escalation trigger
Actual highway exposure versus planned route	Dispatch changes can invalidate assumptions	Dynamic pressure rises and hold margin collapses	Pilot on highest-speed lane before full rollout
Wash chemistry and pressure setting variance	Rarely controlled fleet-wide	Graphic abrasion and adhesive/edge stress	Define approved wash SOP and remove magnets pre-wash
State-by-state private vehicle sign-placement limits	Pending confirmation (no unified public US dataset)	Multi-state campaigns can pass tool fit but still fail local placement constraints.	Run legal/operations review by deployment state before scaling beyond pilot.
Public benchmark for lifecycle cost by medium	Pending confirmation (no reliable public dataset with consistent national methodology)	Upfront-only pricing can hide maintenance labor and replacement-frequency cost.	Build internal 90-day pilot cost ledger before committing long-horizon media choice.
Public benchmark for detach rate by door seam depth x speed lane x magnet size	Pending confirmation (no reliable normalized public dataset)	Teams may overgeneralize one fleet anecdote and under-scope pilot requirements.	Capture seam-specific edge-lift/detach rates during pilot and use that internal baseline for rollout thresholds.

10) Risk matrix and mitigation plan

Qualitative review priorities and consequences. These are editorial controls, not measured probabilities or failure rates.

Illustrative priority matrix, not plotted field data. Resolve placement exclusions first; review supplier, route, and care controls before any purchase order.

Risk	Review priority	Impact	Mitigation
High-speed edge lift and fly-off	Medium	High	Limit speed by route policy, verify corner radius, and complete pilot run at peak route speed.
Finish haze from trapped moisture and grit	Medium	Medium	Daily remove-clean-dry cycle and a clean mounting surface, following the exact media supplier instructions.
Incorrect placement on non-steel body panels	High	High	Perform pre-install steel verification; do not deploy magnets on aluminum/plastic zones.
Design fades faster under high UV duty	Medium	Medium	Use UV-stable print stack, shorten refresh interval, and prioritize high-contrast layouts.
Campaign mismatch (temporary medium used for long-term route)	Medium	Medium	Use the comparison matrix early and switch to vinyl/wrap for multi-year programs.
Regulatory visibility conflict on CMV deployments	Medium	High	Keep legal IDs/permanent conspicuity elements separate from removable magnets and enforce install-photo audits.

11) Scenario walkthroughs

Illustrative scenarios use stated assumptions; none are customer case studies, measured field results, or deployment approval.

Local service van with verified doors

Assumptions: 24 × 18 in, 50 signs, 6 months, 55 mph, verified full contact, documented media, daily care, promotional graphics only.

Outcome: Checklist complete; no retention, service-life, or safe-speed approval is implied.

Next step: Request supplier data and a controlled sample/pilot plan before batch production.

Aluminum door on a low-speed city route

Assumptions: 18 × 12 in, 30 mph, daily care; intended door footprint is aluminum or unknown.

Outcome: Hold at every speed. Lower speed cannot make the door magnetically receptive.

Next step: Verify a different steel footprint or ask an installer to quote a compatible adhesive graphic.

Steel door with a recessed molding

Assumptions: 24 × 18 in, 45 mph; the sign spans trim and cannot make full contact.

Outcome: Hold. Nominal dimensions and route speed do not resolve the air gap.

Next step: Resize or move the footprint and document full contact before any trial.

Mixed leased service vans with seasonal door campaigns

Assumptions: 24 x 18 in door magnets, 55-75 mph mixed routes, partial rental units, steel-zone validation completed on most but not all vehicles.

Outcome: Conditional. Program can proceed only after rental-marking controls and high-speed pilot evidence are both closed.

Next step: Split legal IDs from campaign graphics, run high-speed pilot on worst-case lanes, and lock a media fallback for non-steel doors.

12) Decision FAQ

Grouped answers for tool usage, field operations, and media switching decisions.

Fit, geometry, and media

Will custom car door magnets stick to every vehicle?

No. Verify ferromagnetic steel across the entire footprint on each door. Aluminum, plastic, body filler, and unverified panels are excluded even at low speed.

Can a magnet cross moldings, badges, seams, or recesses?

No. The cited Magnum care guidance requires full contact without air pockets. Resize or relocate the sign to a smooth steel zone before requesting a trial.

What does the fit checker actually establish?

It screens entered assumptions for placement, care, media, route, and compliance review. It does not measure retention, predict a safe speed, or approve deployment.

Why is the default door contact unverified?

Example dimensions cannot establish contact on your vehicle. Confirm the real door footprint and finish before changing this input to verified full contact.

Does 30 mil thickness guarantee vehicle retention?

No. Thickness is a quote baseline, not holding-force evidence. Request the exact product datasheet, supplier confirmation for vehicle use, and a controlled sample plan.

Is 55 mph a safe speed for a door magnet?

No. It is an editorial review trigger in this checklist. Pressure grows with speed squared, but the equation does not determine peel force, magnetic holding margin, or a safe operating speed.

Care, compliance, and ordering

How often should vehicle magnets be removed and cleaned?

The cited Magnum guidance recommends daily removal and cleaning of the sign and mounting surface. Follow the exact media supplier instructions; use another medium if the required routine cannot be maintained.

Can magnets go on fresh paint or repainted doors?

The cited care guidance excludes repainted surfaces. Cure-time guidance does not override that exclusion. Confirm finish compatibility with the supplier; do not approve an uncertain finish from this checklist.

Can removable magnets carry mandatory CMV markings?

For applicable US CMVs, 49 CFR 390.21T permits removable devices subject to identification, both-side display, contrast, stationary 50 ft daylight legibility, and maintenance conditions. The fleet compliance owner must confirm the actual marking plan.

Does every lease qualify for the 30-day rental marking option?

No. Section 390.21T(e) covers rented CMVs and leased passenger-carrying CMVs for terms no longer than 30 calendar days, with specified marking and documentation options. Confirm eligibility rather than treating any lease as covered.

When should I request decals or wrap instead?

Review adhesive media when the door is non-steel, contact is interrupted, daily magnet care is impractical, or pilot evidence is unsatisfactory. An installer must confirm substrate, finish, removal method, and cost for the exact film. 3M 2080 is a color-change wrap reference, not a universal printed-logo specification.

What should I send with a quote request?

Copy the result summary and include door photos, vehicle models, dimensions, sign count, artwork, route and weather, media documentation, and the intended care routine. Request a sample and pilot review before batch production; no price or delivery commitment is calculated here.

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Review artwork and campaign assumptions alongside the vehicle fit checklist.

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Switch to the print-program workflow when artwork throughput and economics are primary constraints.

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Validate when custom setup outperforms stock options for your time-to-launch target.

14) Move to quote with reduced ambiguity

Send this result context to the team so engineering, purchasing, and operations can start from the same assumptions.

Use this page as a single decision lane: run the tool, validate evidence and limits, choose the medium, then submit the quote package. If your result is conditional or not-fit, include pilot/fallback requirements in the inquiry note to avoid rework loops.

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Specifications

Primary use case	Temporary or rotating vehicle branding on verified steel panels
Baseline material route	30 mil vehicle-grade magnetic sheeting with rounded corners
Core operating variables	Route speed, panel material, weather lane, and cleaning cadence
Result payload	Fit band, confidence score, pressure trend, assumptions, and action-ready next steps
Decision boundary	Mixed-material body + sustained highway speeds usually requires fallback media
Primary CTA	Quote + pilot planning via WhatsApp/email inquiry