Sumo Spring Rear Bump StopsUpgrade your van's suspension with Sumo Spring Rear Bump Stops, designed to reduce rear sag and improve control for heavy loads or towing. Made in the USA, these proprietary closed microcellular urethane bump stops contact the rear axle sooner, increasing the rear suspension spring rate. They're perfect for vans that carry heavy loads most of the time. The additional spring rate will reduce rear suspension sag when loaded, resulting in a smoother