Gross combined weight rating
The gross combination weight rating (also Gross Combination Mass and maximum authorised mass), which can be abbreviated to GCM, MAM, GCWR is the maximum allowable combined mass of a towing road vehicle, passengers and cargo in the tow vehicle, plus the mass of the trailer and cargo in the trailer. This rating is set by the vehicle manufacturer.
When used with trains in the UK, the GCWR is also known as the gross train weight (GTW). The GCM is a function of the torque output of the engine, the capacity and ratios of the transmission, the capacity of the driving axles and tyres, the capacity of the radiator, and the ability of the chassis to withstand that powertrain torque.
- "Towing a Trailer - Being Equipped for Safety". National Highway Traffic Safety Administration. Retrieved 2009-04-29.
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