Lippert Components 314336 Equa-Flex Spread Axle Suspension Upgrade Kit Equa-Flex rubberized equalizers replace standard cast equalizers to provide a more comfortable towing experience by absorbing road shock/vibrations and reducing fore to after trailer movement knows as chucking 5,200-pound axle capacity Spread tandem axle configuration Easy bolt-on installation; Trailair by Lippert Components Equa-Flex Suspension Upgrade Mounting hardware included