Final answer:
GCWR stands for Gross Combination Weight Rating, which is the maximum legal weight of a towing vehicle, its cargo, the trailer, and the trailer's cargo. This specification ensures vehicle safety and legal compliance.
Step-by-step explanation:
Gross Combination Weight Rating (GCWR) refers to the maximum allowable combined mass of a towing road vehicle, its passengers and cargo, and the total weight of the trailer and its cargo. This is a critical specification for vehicles designed for towing, as it ensures safety and compliance with legal restrictions on vehicle weights. The GCWR is determined by the vehicle manufacturer and takes into account the capabilities of the engine, transmission, brakes, and frame, among other factors. In essence, it is the total allowable weight that the vehicle can handle without risking mechanical failure or legal issues.