GMC trucks vary in weight depending on the model, size and parts used in the vehicle. For instance, the Sierra 1500 Denali with a short box truck bed and standard engine weighs 5,042 pounds, but the Sierra 2500HD with a long box bed and more powerful engine weighs 7,068 pounds.
The type of engine used in a truck will greatly affect the weight. A more powerful engine can add several hundred pounds to the weight of a truck of the same model and size as another truck with a different engine. When using a truck, also pay attention to the gross vehicle weight rating, which will list how much weight the truck can handle, including the weight of the truck itself.