Start at the door label
The Tire and Loading Information label gives the combined occupant and cargo allowance for that specific vehicle as labeled. A brochure’s maximum payload describes a different reference configuration. Do not copy that marketing maximum into your vehicle’s payload field.
List occupants, cargo, accessories added after the label baseline, and hitch hardware. Equipment already included in that baseline should not be counted a second time. The trailer’s static tongue load also consumes capacity under the applicable manufacturer instructions.
Three trailer numbers with different jobs
UVW or dry weight describes an unloaded reference condition. Check which equipment and fluids it includes. Loaded trailer weight is the actual entire trailer mass, including the portion supported by the hitch. Trailer GVWR is a limit, not a measurement.
A dry-weight estimate needs each additional load accounted for. A measured loaded trailer weight already includes the contents on board: adding the water and camping gear again would overstate it.
Why the tongue is not added twice
Consider a ready-to-travel, unhitched vehicle weighing 6,000 lb, a 6,500 lb loaded trailer, and 700 lb of static tongue load. Without weight distribution, the vehicle carries 6,700 lb on its axles and the trailer carries 5,800 lb on its own axles. Together they weigh 12,500 lb: 6,000 + 6,500, not 13,200.
If vehicle additions total 1,000 lb, payload use including the tongue is 1,700 lb. That exceeds a 1,600 lb door-label allowance even though 12,500 lb is below a 15,000 lb GCWR. Passing one constraint says nothing about the others.
Weight distribution needs a different measurement
A weight-distributing hitch changes the axle reactions of the truck and trailer. It does not increase GVWR, GCWR, axle ratings, or component ratings. This tool uses axle measurements in the actual adjusted condition. It does not assign a fixed percentage of tongue weight to each axle or reduce payload use automatically.
Read the scale guide, then consult the owner manual for your exact vehicle and hitch adjustment procedure.