Vehicle lookup / identity before ratings
A VIN identifies the vehicle. A free decode may not include its tow rating.
Use free U.S. government data to identify a tow vehicle. HitchMargin then checks whether a documented manufacturer VIN tool can continue the search and shows every rating that still needs verification.
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.
Why the answer has two stages
Identity is decoded. The rating source decides what comes next.
NHTSA says its decoder displays information reported by the manufacturer. That makes it useful for make, model, model year, body, engine, and other identity clues. The free public decode does not universally establish the payload printed on this vehicle's door label or a configuration-exact trailer rating.
Some manufacturers can use the VIN as a key to their own build records. For example, Ford documents a VIN-based calculator for supported 2020-and-newer F-Series pickups. Where an official path exists, HitchMargin links to it instead of pretending NHTSA supplied the rating.
When several manufacturer table rows may still match, a future HitchMargin range will include only reviewed official rows and list the unresolved configuration fields. Until that evidence exists, the result says no supported range instead of showing a model-line maximum.
Once you have the exact numbers, the free calculator compares their remaining margins and shows which entered limit is tightest.