Towing advertisements love one number: the maximum tow rating. In practice, that figure is the best case for a specially equipped vehicle with just a driver on board. What you can actually tow depends on several ratings working together, and the one that runs out first sets your limit. Once you understand them, every towing question becomes simple arithmetic.
The ratings at a glance
| Rating | What it limits | Where to find it |
|---|---|---|
| GVWR | Total weight of the loaded vehicle (or loaded trailer) | Door-jamb certification label; trailer VIN plate |
| GAWR | Weight on each single axle | Door-jamb certification label; trailer VIN plate |
| GCWR | Loaded vehicle plus loaded trailer together | Owner’s manual or manufacturer’s towing guide |
| Payload | People, cargo and hitch weight the vehicle can carry | Tire and Loading label; or GVWR − curb weight |
| Tow rating | Maximum loaded trailer weight | Owner’s manual or towing guide |
| Hitch ratings | Trailer weight and tongue weight on the hitch parts | Labels on the receiver, ball mount, ball and coupler |
| Tire load rating | Weight each tire can carry at a given pressure | Tire sidewall |
GVWR: Gross Vehicle Weight Rating
GVWR is the most the vehicle may weigh when fully loaded: the vehicle itself, fuel, every passenger, all cargo and the weight the trailer puts on the hitch. It is set by the manufacturer from the strength of the frame, suspension, axles, wheels, tires and brakes. A trailer has its own GVWR too, printed on its VIN plate, which caps the weight of the loaded trailer.
GVWR does not change when you add airbags, helper springs or bigger tires. Those parts can make a heavy load ride better, but the other components were still designed for the original rating.
Curb weight and payload
Curb weight is the vehicle with full fluids and standard equipment but nobody on board. Payload is the difference between GVWR and curb weight: everything you are allowed to add. Options such as a bigger engine, four-wheel drive, a crew cab or a sunroof all add curb weight and reduce payload, which is why two trucks of the same model can have very different payloads.
The yellow Tire and Loading Information label in the driver’s door jamb states the combined weight of occupants and cargo for that exact vehicle as it left the factory. Anything added later, such as a bed cover, toolbox or hitch, comes out of that number. When you tow, tongue weight (or fifth wheel pin weight) also counts as payload, and it is often the first limit a pickup reaches. The payload calculator adds it all up.
GAWR: Gross Axle Weight Rating
Each axle has its own limit, the GAWR, listed separately for front and rear. It matters because weight is rarely shared evenly. Tongue weight sits behind the rear axle, so it pushes the rear down and lifts some load off the front. A truck can be under its GVWR and still over its rear GAWR. See how tongue weight and cargo move between axles with theaxle load calculator.
GCWR: Gross Combined Weight Rating
GCWR is the most the whole rig may weigh: the loaded tow vehicle plus the loaded trailer. It reflects how much the engine, transmission, cooling system and brakes can handle together. Because GCWR includes the tow vehicle, every pound of people and cargo in the truck is a pound less trailer you can pull. That is the key idea behind thetowing capacity calculator: real towing capacity is GCWR minus the loaded vehicle, capped at the tow rating.
Tow rating (maximum trailer weight)
The tow rating is the heaviest loaded trailer the manufacturer approves. It usually assumes a lightly loaded vehicle, a specific axle ratio and sometimes a weight distribution hitch. Many manufacturers rate trucks and SUVs using a standard method (SAE J2807) that tests acceleration, hill climbing, handling and braking with a defined test weight, so published ratings are more comparable than they once were. Still, the rating is a maximum, not a target. Many experienced towers keep the loaded trailer at or below 80% of it for a margin on hills, in wind and in emergencies.
Tongue weight and pin weight
Tongue weight is the downward force the trailer coupler puts on the hitch ball. For a conventional (bumper-pull) trailer it should be about 10–15% of the loaded trailer weight: too little invites sway, too much overloads the rear axle and the hitch. Fifth wheel and gooseneck trailers carry more on the truck, typically 15–25%, because the load sits over the rear axle instead of behind it. Check your numbers with the tongue weight calculator.
Hitch and tire ratings
The receiver, ball mount, ball and trailer coupler each have a maximum trailer weight and a maximum tongue weight. The lowest one applies to the whole hitch, and it may be lower than the vehicle’s tow rating. Tires have a load rating at a given cold pressure; on a trailer, the tires carry everything that is not on the hitch. A tire that is underinflated cannot carry its rated load.
Where to find the labels
- Certification label (driver’s door edge or door pillar): GVWR, front and rear GAWR and the VIN.
- Tire and Loading Information label (same area): maximum occupants and cargo, original tire sizes and cold pressures.
- Owner’s manual and towing guide: GCWR, maximum trailer weight, tongue weight limits and equipment requirements, often by engine and axle ratio.
- Trailer VIN plate or sticker (usually on the tongue or the front left corner): trailer GVWR, GAWR, tire size and cold pressure.
- RV weight label (often inside a cabinet): unloaded vehicle weight and cargo carrying capacity.
- Hitch labels: on the receiver, ball mount, ball and coupler.
Which limit wins?
All of them apply at the same time, so the lowest one decides. A simple order of checks catches nearly every problem:
- Loaded trailer weight is under the trailer’s GVWR and under the vehicle’s tow rating.
- Passengers, cargo and tongue weight fit within payload.
- Loaded vehicle plus loaded trailer is under GCWR.
- Front and rear axle loads are under their GAWRs.
- Every hitch component is rated for the trailer weight and the tongue weight.
- Vehicle and trailer tires are rated for their share of the load at the pressure you run.
Our guide to matching a trailer to your truck walks through those checks with real numbers.
Dry weight is not towing weight
Trailer and RV brochures list a dry or unloaded weight. Nobody tows a dry trailer: water, propane, batteries, food, bedding, tools and gear add hundreds or thousands of pounds. When you plan, use the loaded weight you expect, or the trailer’s GVWR as a safe worst case. Weigh the loaded rig at a certified scale at least once; the truck scale guideshows how.
This guide is general information. Your vehicle, hitch, trailer and tire manufacturers’ ratings and instructions always come first, and towing rules vary by state, province and country. See our disclaimer.