auto leveling system for on-highway travel. Tires 10 tires, 20.5 R25. Steering Dual circuit steering system is hydraulic power assisted with a transfer case mounted, ground driven, emergency steering pump. Axles 1, 2, 3 and 5 steer on highway. Separate steering of the 4th and 5th axle for all wheel steer and crab-steer is controlled by an