V8 5.4 L Gasoline Engine, 2007 US EPA Label, Automatic Transmission, 3800 lb Front Axle, 6084 lb Rears, 9600 lb GVWR, 245/75R16, Spring Suspension, 138 in Wheelbase, Knapheide 10 ft 8 in Body

Vortec V8 4.8 L Gasoline Engine, 2017 US EPA Label, Automatic Transmission, 4100 lb Front Axle, 5360 lb Rears, 8600 lb GVWR, 245/75R16, Spring Suspension, 158 in Wheelbase, Curbside Door