DRIVER DOOR
Read the exact payload label.
Copy the combined occupant-and-cargo limit from this vehicle, including any corrected capacity label.
The tow rating is only one limit.
Know whatruns out first.
Turn your door label, owner manual, hitch label, and scale weights into one honest towing margin report. Payload first. Every limit visible. Vehicle identity without capacity guesswork.
- Free
- No account
- Runs in your browser
ILLUSTRATIVE REPORTWeekend trailer setup
PAYLOAD FIRSTPayload215 lb left
1,435 / 1,650 lb
Tow rating1,500 lb left
6,500 / 8,000 lb
Receiver tongue155 lb left
845 / 1,000 lb
The trailer is under the advertised tow rating, but payload is the tighter constraint.
Example only. Not a vehicle record.
Free NHTSA-backed lookup
Identify the vehicle. Find the rating path.
Pick a year, make, and model—or decode a VIN. HitchMargin checks for an official next step, but only publishes a numeric configuration range when reviewed manufacturer rows still match the vehicle.
WORKSHEET 01CONVENTIONAL TRAILERS
Payload-first fit check
Find the number that runs out first.
Bring ratings from labels, manuals, and scale tickets. HitchMargin does the arithmetic and shows every margin—without pretending it verified your inputs.
WHY THIS EXISTSTHE PAYLOAD PROBLEM
A maximum is not your margin.
A trailer can fit the tow rating and still consume the truck.
Tongue weight lands on the tow vehicle. So do people, pets, bed cargo, accessories, and hitch hardware. They all draw from the same vehicle capacity before the trailer ever moves.
HitchMargin compares those demands openly, then names the tightest entered limit. It never upgrades a rating, fills a missing axle ratio, or turns a partial VIN decode into false precision.
See every formula01People
+02Cargo
+03Hitch
+04Tongue
=CHECKPayload used
Better inputs, better decision
Start at the vehicle. End at the scale.
A clean result begins with source numbers—not a search snippet or a model-line maximum.
OEM + RECEIVER
Match the real configuration.
Use the exact model-year guide and receiver label. Axle ratio, drivetrain, wheelbase, and tow package can change the answer.
CERTIFIED SCALE
Replace estimates with weights.
Weigh the trip-ready combination and axles. A scale ticket beats brochure dry weight every time.
Not sure where the official documents live?
Open the source finderPLAIN-ENGLISH LIBRARYSOURCE-BACKED GUIDES
Learn the terms once
Start with the complete trailer towing guide.
Follow one plain-English path from vehicle identity and official ratings to loaded trailer, payload, hitch, axle, and scale checks.
The refusal rule
If a critical number is unknown, the answer is incomplete.
NHTSA’s free VIN decoder is useful for basic vehicle identity, but it does not provide the exact tow rating, payload label value, or axle ratio needed for a universal configuration-exact answer. Some manufacturer tools can continue from the VIN; otherwise HitchMargin labels the missing checks instead of manufacturing certainty.
See what a VIN can and cannot resolve