- Gross combination mass
A Gross Combination Mass (GCM) is the maximum allowable total
massof a fully loaded motor vehicleand all of its trailers.
The GCM is the maximum that the sum of the
Gross Vehicle Massand the Gross Trailer Masses of all of the trailers is allowed to be.
The GCM is a function of the
torqueoutput of the engine, the capacity and ratios of the transmission, the capacity of the driving axles and the ability of the chassisto withstand that Powertraintorque.
Aggregate Trailer Mass
Gross Vehicle Mass
Gross Trailer Mass
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