Transit SUMO SPRING REAR BUMP STOPS, 2800LB - (2015+) PAIR2800LB Spring Rate The Sumo Spring replaces the factory rear bump stops. It contacts the rear axle sooner to increase the rear suspension spring rate while still compressing to the height of the factory bump stop. Suspension travel is not reduced. The additional spring rate reduces sway, improves control in high winds and comfort while the suspension cycles. Recommended for vans that carry heavy loads most of the time or tow trailers. The additional