This is our most popular compressor and air control system for trucks, vans, and SUVs. The basic system controls rear bags together for front-to rear leveling; the dual-path model controls the springs independently for side-to-side and front-to-rear leveling. All kits include our exclusive wiring harness for fast, easy installation. To eliminate the major cause of air spring failure, our Low Pressure Sensor automatically activates if pressure falls below the minimum safe level. * Add the Load Controller to your Air Springs to get Lifetime Warranty on Springs