The 2020 GMC Sierra 3500HD is a heavy-duty, full-size pickup truck with a maximum payload/towing capacity of 7,442/35,500 pounds. It is offered in regular, double, or crew cab body styles. Regular or long bed lengths are available. Regular cab models only come in the long bed.
Five trim levels are available: Base, SLE, SLT, AT4, and Denali HD.