Axle Weight . The weight transmitted to the ground by one axle or one set of axles. The maximum safe weight a tire can carry at a specified pressure. This rating is stated on the side of each tire. Suspension systems .
Suspension systems have a manufacturer's weight capacity rating.
Coupling device capacity . You must keep weights within legal limits. States have maximums for GVWs, GCWs and axle weights. Often, maximum axle weights are set by a bridge formula. This is to prevent overloading bridges and roadways.