Machine description: V8 Gasoline Engine, 14909 Engine hrs, Automatic Transmission, 4800 lb Front Axle, 7050 lb Rears, 265/70R18 Front Tires, 265/70R18 Rear Tires, Spring Suspension, 170 in Wheelbase, 8 ft 9 in x 78 in Bed... more info about the 2012 GMC SIERRA 3500HD.