Appendix B
Weight Distribution
C. In Figure B–2, the load (L) is located 133 in. (3378 mm) from the front axle. Moving the load
towards the rear axle changes the weight distribution. Use equations 1 and 2 to determine the
portion of the load carried by each axle.
Front Axle
Figure B-2. Unbalanced Load: CGf 133 In. From Front Axle
CGf = 133 in. (3378 mm)
Lr =
CGf
WB
X L
133
214
(100) = 62.14 lbs (28.18 kg)
Lf = L - Lr 100 – 62.14 = 38.86 lbs (17.6 kg)
• The rear axle now carries a greater proportion
of the load than the front axle.
Although it is usually not important to know the CG of the chassis; it is important to know the CG location of truck
bodies, accessories, or loads that may be placed on the chassis. This example shows that the location of the CG
of an object relative to the front and rear axles (FA and RA) affects the load carried by each axle.
For most relatively uniform objects such as van bodies and fuel tanks, the CG is located close to the midpoint of
the object. For non–uniform objects such as liftgates and refrigeration units, obtain the CG from the equipment
manufacturer.
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