Enhance your towing experience in your GM 2500HD/3500 2WD/4WD with the Front SuperSprings Solo HD SumoSprings. The SumoSprings Solo HD feature a 2500lb capacity and are a patented suspension product designed to enhance load carrying ability, stabilize sway, and improve overall driver control and ride comfort. They are maintenance free, do not leak air, and do not require airlines or compressors. They are manufactured from proprietary closed micro-cellular urethane providing a smooth and progressive spring rate with superior damping properties.