V8 6.0 L Compressed Natural Gas (CNG) Engine, 2012 US EPA Label, Automatic Transmission, 4600 lb Front Axle, 6084 lb Rears, 9600 lb GVWR, 245/75R16 Front Tires, 245/75R16 Rear Tires, Spring Suspension, 136 in Wheelbase, 9 ft x 73 in Wide x 51 in High Body