Air Lift 88295 LoadLifter 5000 Ultimate Air Spring Kit with Internal Jounce Bumper Exclusive internal jounce bumper inside, springs absorb shock Up to 5,000 pounds of load leveling capacity Maintenance free and drivers can safely run with zero air pressure Eliminates harsh jarring on rough roads. Air adjustable from 5 to 100 PSI Fits single rear wheel srw and dual rear wheel drw models. Will fit most side mount fifth wheel hitch applications. Does not fit cab and chassis applications