The rear height is adjusted by the Automatic level control. The system consists of a level sensor,air compressor, and rear air shocks. The level sensor can be adjusted. According to my manual, you must measure foward from the rear wheel centerline exactly 23 1/8" to the underbody point. Measure between the underbody point and the ground. Measurement should be between 8 3/8 and 9 3/16"