Your VIN doesn’t contain a towing number. That surprises a lot of truck owners, and it’s why so many free “VIN towing lookups” hand back a brochure maximum instead of the rating for your truck. Checking towing capacity by VIN number does work, but only when the VIN goes into the automaker’s own tool, which matches it to the exact axle ratio, engine and hitch package your truck left the factory with.
Quick answer: You can find towing capacity by VIN number through the automaker. Ford’s VIN Towing Calculator and Ram’s online towing guide return the exact tow rating for a specific truck. GM trucks from 2019 on carry a door-jamb trailering label you can do the math from. Generic decoders only show a weight class.
Last updated: November 7, 2026
What does a VIN actually tell you about towing?
A VIN is 17 characters that identify the maker, model, model year, plant and a few build details. When you run it through the federal decoder, the NHTSA vPIC VIN decoder, you get back about 140 fields, according to an October 2026 guide to the vPIC system from CarWhere. The closest thing to a towing number in there is GVWR, shown as a class range such as “Class 2E: 6,001–7,000 lb.”
That’s the gross vehicle weight rating band, the most the truck itself may weigh loaded. It isn’t a tow rating, and two trucks in the same class can differ widely in trailer capacity. vPIC also only holds what manufacturers file, so some fields come back blank.
So the VIN is a key, not an answer. The automaker’s build records connect that key to the parts that set the rating: the axle ratio, the cab and bed, the engine, the cooling package and whether a factory tow package was installed.
How do you check towing capacity by VIN number for each brand?
Ford, Ram and GM each handle it differently. Here’s how the three compare, based on the tools as reported by TFLtruck.
| Brand | Where to look | What you get | Catch |
|---|---|---|---|
| Ford | VIN Towing Calculator on Ford Fleet Live | Exact towing and payload, plus leftover payload | Built for fleets; older trucks may not be covered |
| Ram | Ram towing guide, enter VIN | Exact towing and payload for that truck | Works for 2009 and newer models |
| GM (Chevy, GMC) | Driver’s door-jamb trailering label on 2019 and newer trucks | Build-specific weights, not the tow rating itself | You do the math |
Ford: the VIN Towing Calculator
Ford launched its VIN Towing Calculator in 2021, according to TFLtruck’s April 2, 2021 report. You type in the VIN and it returns the exact towing and payload ratings, plus how much payload you have left. That last figure is the one most people skip, and it’s the one that bites first.
The tool sits on Ford’s fleet site, so it’s built around trucks Ford still has build data for. If it returns nothing for an older F-150, the owner’s manual and Ford’s yearly towing guide for that model year are the fallback, matched against the axle code on your door sticker. Our Tacoma vs Ranger comparison shows how much ratings move between configurations of one model.
Ram: the online towing guide
Ram’s towing guide lets you enter a VIN and get the exact towing and payload rating for that truck. TFLtruck’s August 29, 2018 report says it works for 2009 and newer models, which covers most Ram trucks still on the road.
Published ratings also get revised from one guide year to the next, which is the case for checking by VIN instead of trusting a figure you remember from a brochure.
GM: what the door sticker tells you
GM took a different route. Starting with 2019 trucks, it added a trailering label on the driver’s door jamb listing the key weights for that exact build, but not the tow rating itself. You can work the rating out in two ways, as TFLtruck laid out in 2018.
The first uses tongue weight. GM sets maximum tongue weight at 10% of maximum trailer weight, so a label showing 930 lb of tongue weight means a 9,300-lb tow rating. The second subtracts the truck’s weight from the gross combined weight rating. With a 15,000-lb GCWR and a 5,531-lb truck, that leaves about 9,469 lb for the trailer.
The two answers differ by roughly 170 lb because GM assumes a driver of about 200 lb in its rating. Use the lower figure. If you want the window sticker for the same truck, which lists the axle ratio and trailering package, our guide to getting a window sticker by VIN covers Chevy, Ram and Ford.
Why the number on your VIN lookup may be wrong for your trailer
This is where most people go wrong at the dealer or the RV lot. The tow rating assumes a truck with only a driver aboard. Load the crew cab with four adults, a cooler and a generator in the bed, and every pound comes out of payload. Tongue weight comes out of payload too.
Here’s the trap in numbers. A trailer with a 9,000-lb loaded weight puts roughly 900 lb on the hitch at a 10% tongue weight. If your truck’s payload is 1,500 lb, that leaves 600 lb for people and cargo. Two adults and a full bed can use that up before you leave the driveway, and you’ll be over payload while still under the tow rating.
Axle ratio is the other quiet variable. Two trucks with the same engine can carry very different ratings because one has a numerically higher axle ratio. Third-party VIN sites fill blank fields with generic spec data, so they can miss that difference. That’s the main reason to use the automaker’s tool when there is one.
What to do before you buy a truck or a trailer
If you’re shopping used, run the VIN through the maker’s tool before you hand over a deposit. A seller’s ad that says “tows 12,000” usually quotes the best case for that model, not the truck in front of you. Our Ram RHO vs TRX comparison is a good example of how far ratings can sit apart even inside one brand’s lineup.
If you’re shopping for a trailer, get its loaded weight, not the dry weight on the sales sheet. Dry weight leaves out water, propane, batteries and gear. Then compare tongue weight against what’s left of your payload after passengers.
There are limits to all of this. The automaker tools can change addresses or go offline, and the ones here are as TFLtruck reported them in 2018 and 2021. A rating also says nothing about whether your hitch, brake controller and tires are set up for the load. When in doubt, the tire-and-loading label on the door jamb is the final word on payload for that truck.
The single most useful number isn’t the tow rating at all. It’s your remaining payload after passengers and tongue weight, and checking towing capacity by VIN number through Ford’s or Ram’s tool is the fastest way to get it.
Towing capacity by VIN number FAQ
Can you find towing capacity by VIN number?
Yes, but not from the VIN itself. The VIN identifies your truck’s exact build, and automaker tools like Ford’s VIN Towing Calculator and Ram’s online towing guide use it to return a specific tow rating. Free generic decoders, including NHTSA’s vPIC, show only a weight class, which isn’t the same thing.
Where is the towing capacity on my truck?
Check the driver’s door jamb first. GM trucks from 2019 and newer carry a trailering label with build-specific weights you can use to calculate the rating. Every vehicle also has a tire-and-loading label showing payload. Ford and Ram owners can enter the VIN in the automaker’s online tool for the exact figure.
How do I calculate my truck’s towing capacity?
Subtract your truck’s loaded weight from its gross combined weight rating, or GCWR. A 15,000-lb GCWR and a 5,531-lb truck leave about 9,469 lb for a trailer. On GM trucks, you can also multiply maximum tongue weight by 10. Then check that tongue weight and passengers stay within payload.