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Sold as a pair left and right Maintenance-free Reduces and absorbs vibration 500 lb Capacity at 50% Compression Reduces overall cost of ownership Trailer SumoSprings utilize the same micro-cellular air springs as SumoSprings. They mount above trailer leaf spring assemblies and create a cushion between the axle and trailer frame. Trailer SumoSprings reduce wear and tear on body-frames windows doors closets mounted TV’s and other components by minimizing bounce hop and sway associated with most tow-able RV’s. Reduced sway and bounce in the trailer results in increased driver control ride comfort reduced maintenance costs and reduced overall cost of trailer ownership.