No leaky air, no frozen air lines, no squeaky overload springs, just a better ride for your truck or RV. SumoSprings for RV’s,trucks, SUV’s, Vans, improved ride with closed cell polyurethane For Trailers Now for Trailers TSS-106-40: New for “spring under axle” for each trailer axle. For trailers with less room between axle and trailer frame. Best way to add a SUMO like … Continue reading Sumo Springs Review