V6 4.3 L Gasoline Engine, 2018 US EPA Label, Automatic Transmission, 4100 lb Front Axle, 5360 lb Rears, 8600 lb GVWR, 245/75R16 Front Tires, 245/75R16 Rear Tires, Spring Suspension, 156 in Wheelbase, GMC 11 ft x 74 in Wide x 55 in High Body PROFESSIONALLY-MAINTAINED-FLEET-VEHICLE-PAG ;