Feature Eliminate Suspension Sag And Cushion Road Shock Reduce Sway And Improve Roll Stability Easy To Install With Basic Hand Tools Improves Roll Control Trouble And Maintenance Free Satisfaction Guarantee And Lifetime Warranty Used To Carry Heavy Cargo Or Towing Trailers SES Kits are designed to enhance the suspension of your vehicle. Easiest to use: Rubber cushions absorb road shocks and automatically adjust to uneven loads or road conditions. Easiest to maintain: There are no airlines or fittings to allow leaks. Simply bolt the kit on and you are set for a lifetime of trouble free suspension.Easiest to install: There are no holes to drill, no airlines to route and SES Kits can be installed in a matter of minutes using basic hand tools. The softer ride quality of todays trucks and the mediocre suspensions found on most trailers can cause excessive trailer sway, instability and suspension settling.