The GMC Sierra 3500 is a heavy-duty pickup truck. It is a full-size, four-wheel drive pickup and the largest in GMC's Sierra lineup. It has a maximum tow capacity of up to 22,900 pounds and a maximum payload of 7,153 pounds. The Sierra 3500 is available in either two- or four-wheel drive with a variety of engine options, including a 6.6-liter turbodiesel V8. It has a variety of trim levels including a Denali edition with added luxury features.