Cummins ISX 400 6 Cylinder 15 L Diesel 400 hp Engine, 2004 US EPA Label, Eaton Fuller 10-Speed Manual Transmission, 12000 lb Front Axle, 40000 lb Rears, 52000 lb GVWR, 11R22.5, Air Ride Suspension, 170 in Wheelbase, Wet Kit, Air Sliding 5th Wheel, Dual Fuel Tanks