Guide
How to read the door sticker before you tow a fifth wheel
Payload, GVWR, GAWR, and GCWR live on the driver's door. Here is what each number means for a Ram 2500 or 3500 pulling a 40-foot fifth wheel, and what RigFix will not invent for you.
The most useful piece of paper on a heavy-duty truck is stuck to the driver's door jamb. It is also the piece people skip, because a brochure already printed a huge tow number.
That brochure number is a best case for a configured truck, not a promise about the truck in your driveway. RigFix will not look it up for you. The towing check on this site only does math with numbers you type.
What the sticker is actually saying
Four ratings show up, and they are not interchangeable.
GVWR is the most the truck itself may weigh, ready to drive, with people, cargo, fuel, and the pin weight sitting on it. It is a cap on the truck, not on the trailer.
Payload is how much of that GVWR is left after the truck's own weight, as the factory built your specific truck. Passengers, dogs, a generator, hitch hardware, and fifth-wheel pin weight all spend the same payload. Pin weight is not free because the trailer has its own axles. The part on the hitch is on the truck.
GAWR is the cap for one axle. A fifth wheel loads the rear axle hard. You can be under payload on paper and still be rude to the rear axle if the pin is heavy and the bed is full. A scale is how you see that. The door sticker will not do it for you.
GCWR is the most the truck and the trailer may weigh together, including people, fuel, water, and gear. It is not a trailer weight. Subtract the truck, as it will actually travel, and what remains is the room left for the trailer. RigFix will not guess the truck's weight. If you have not scaled it, the combined check stays unfinished on purpose.
Why your neighbor's 2500 is not your 2500
A crew cab and a regular cab do not carry the same leftover payload. A 6-foot-4-inch bed and an 8-foot bed do not. An axle ratio that the window sticker bragged about does not override the door. Diesel emissions equipment, a sunroof, and a full-size spare all showed up on the scale when the sticker was printed.
Write down the payload and the GCWR from your door. Write the trailer GVWR from the trailer placard. Write a pin weight you have measured, or a loaded estimate you are willing to check on a scale. Then use the towing check. The model, year, cab, bed, engine, and axle ratio are there so the result is labeled with the truck you described. They do not change the math.
What the sticker will not tell you
It will not tell you the loaded pin weight of a Grand Design-style fifth wheel with full fresh water and a basement full of chairs. It will not tell you whether a campground pull-through is actually long enough. It will not tell you that a fuel-island canopy is 13 feet 6 inches and your air conditioner is not.
Those are separate jobs. The sticker's job is to stop you from borrowing someone else's tow rating.
If the sticker and a forum post disagree, the sticker wins. If the sticker and a scale disagree because the truck is now full of people and tools, the scale is telling you how you loaded it. The sticker did not change.
Questions people ask
- Where is the sticker?
- On the driver's door jamb. Use that sticker, not the window sticker from the sales lot.
- Can two trucks with the same badge share a payload?
- No. Cab, bed, axle ratio, packages, and options change the sticker. Copy your own.
- Does RigFix look up a tow rating from the year and model?
- No. The towing check uses only the weights you type.