Paccar 6 Cylinder Diesel Engine, Automated Transmission, 12000 lb Front Axle, 40000 lb Rears, 52000 lb GVWR, Air Ride Cab, 44 in High Rise Sleeper Cab, Thermo King Auxiliary Power Unit, Aluminum Outer Wheels, 295/75R22.5, Air Ride Suspension, 243 in Wheelbase, Air Sliding 5th Wheel, Dual Fuel Tanks