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Product Updates. 2020 Keystone Automotive Operations Inc. All Rights Reserved. 08/07/2020-Rev3 Page-18
Appendix A
Weighing Truck and 5th Wheel Trailer.
Weigh the Truck and 5th Wheel on a public weigh scale. Public weigh scales can be found at Some
Truck Stops, or they can be located from Yellow pages or on the Internet.
Weigh the Truck and 5th Wheel in 3 stages as shown in the sketch.
Step 1, Weigh the both the Truck and 5th Wheel. This is weight 1; this will give the GCW (Gross
Combination Weight) of the Truck and 5th Wheel Trailer. The GCW must not exceed the GCWR
(Gross Combination Weight Rating) for the Truck. The GCWR of a truck depends on engine size,
transmission, rear axle ratio, tow package and other factors. The manufacturer or dealer will be
able to find the GCWR from the VIN (Vehicle Identification Number) of the truck.
Step 2, Drive the front wheels of the truck off the weighing platform. Weigh the rear wheels of the
truck and the 5th Wheel Trailer wheels. This is weight 2, Subtract weight 2 from the weight 1; the
result is the GAW (Gross Axle Weight) for the front axle of the truck. The GAWR (Gross Axle
Weight Rating) for the front axle can be found on the VIN plate on the driver’s side door pillar, the
measured front GAW must not exceed the front GAWR on the VIN plate.
Step 3, Drive the rear wheels of the truck off the weighing platform; this should leave only 5th
Wheel Axles remaining on the weighing platform. This is weight 3, Subtract weight 3 from the
weight 1 and this is the GVW (Gross Vehicle Weight) of the truck. The measured GVW must not
exceed the GVWR found on the VIN plate. Subtract weight 3 from weight 2 and this is the
measured GAW of the rear axle of the truck, and must not exceed the GAWR of the rear axle found
on the VIN plate. Weight 3 is also the GAW of the 5th Wheel; this weight should not exceed the
GAWR on the plate on the 5th Wheel.
Summary:
GCW (Truck & 5
th
Wheel Trailer) = Weight 1
GAW (Front axle of truck) = Weight 1 - Weight 2
GVW (Truck) = Weight 1 - Weight 3
GAW (Rear axle of truck) = Weight 2 – Weight 3
GAW (Axles of 5
th
wheel trailer) = Weight 3
STEP 1
STEP 2
STEP 3
WEIGHT 1
WEIGHT 2
WEIGHT 3
WARNING! EXCEEDING ANY WEIGHT RATING
IS HAZARDOUS. OVERLOADING OF TRUCK
AND/OR 5
TH
WHEEL TRAILER CAN LEAD TO
TIRE FAILURE, BRAKE FADE, &
OVERHEATING OF THE TRUCK ENGINE OR
TRANSMISSION. OVERLOADED VEHICLES
ARE MORE UNSTABLE AND UNPREDICTABLE
IN NORMAL DRIVING CONDITIONS.
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