The weight of a standard GMC Sierra 1500 pickup truck with a 4.3 liter V6 Vortec engine is about 4,460 pounds, according to the GMC website. There are a lot of variables that can affect the weight of the vehicle, including different options and how full the gas tank is.
The standard GMC Sierra 1500 pickup truck has a Gross Vehicle Weight Rating of 6,400 pounds. This means that the total weight that the vehicle can safely hold, including the vehicle, passengers and items in the pickup bed, cannot exceed 6,400 pounds. Because the vehicle itself already weighs 4,460 pounds, the actual additional weight that vehicle can safely hold is around 1,940 pounds.