Cat 3406E 14.6 L Diesel Engine, Air Conditioner, Cruise Control, Engine Brake, Eaton Fuller 18-Speed Manual Transmission, Differential Lock, 12000 lb Front Axle, 38000 lb Rears, 50000 lb GVWR, Air Ride Cab, 63 in Flat Top Sleeper Cab, 295/75R22.5 Front Tires, 295/75R22.5 Rear Tires, Air Leaf Air Ride Suspension, 256 in Wheelbase, Air Sliding 5th Wheel, Dual Fuel Tanks