Steering stabilizers are essentially a shock absorber for your steering system. They are highly recommended for all vehicles with over-sized tires, a winch or snow plow to increase control and handling. Stabilizers dampen out wheel shimmy and help prevent the steering wheel from being jerked out of your hands in rough terrain or when a road hazard is struck by the front wheels. A steering stabilizer is a proven safety device in the event of a blow out. Steering stabilizers are engineered to restrain "bump steer" and front end vibration, giving added life to tires, ball joints and other steering components. A lot of vehicles now come from the factory with a steering stabilizer. After market stabilizers are far superior in performance being specifically designed to handle off-road conditions with lifted vehicles.
http://www.rockymountainsusp.com/W_stabilizers.htm
http://www.rockymountainsusp.com/W_stabilizers.htm