SuperSprings are easily and quickly installed directly above the vehicle?s rear leaf springs. They work in parallel with the vehicle?s existing suspension system and ?kick-in? on demand. The increased spring-rate produced by installing SuperSprings helps eliminate vehicle rear-end sag and improves towing capabilities. SuperSprings unique anti-sway properties reduce body roll providing enhanced driver safety and control. These features are most noticeable when cornering, encountering strong cross winds or dealing with wind buffeting from other traffic.