Original post by Brenan Greene of Trail4runner COMPLETE INSTALL GUIDE & OVERVIEW SumoSprings are a line of bump stops designed and manufactured by SuperSprings International. They are offered for the Toyota, 4Runner, Tacoma, Tundra, along with many other makes and models. SuperSprings International has offered load-carrying enhancement suspension parts for many different trucks, and SUVs since 1996. With a platform such as the 4Runner, …