TOWCHECK FIELD GUIDE
GVWR, GCWR and GAWR explained
GVWR applies to one loaded vehicle, GCWR to the loaded tow vehicle and trailer combination, and GAWR to one axle system. Passing any one check does not imply passing the others.
What the terms mean
Ratings are limits specified by a manufacturer. Scale weights are measurements. Calculated weights are estimates. Keeping those three kinds of numbers visibly separate prevents a generous rating in one area from hiding an overage somewhere else.
Worked example
Common mistakes
- Treating ratings as interchangeable
- Adding unused rating margins together
- Assuming weight distribution changes a manufacturer rating
Frequently asked questions
Does GCWR replace GVWR?
No. Check both independently.
Can the sum of axle ratings exceed GVWR?
It sometimes does, but that does not increase GVWR.
Can a calculator raise a rating?
No. TowCheck only compares entered ratings with loads.
Primary references
These sources support terminology and general planning context. Use the current documentation for your exact vehicle, trailer and components.
Continue with your own numbers
Run the Complete Tow Check, use the scale worksheet, or review the calculation methodology.