Your truck rear springs suspension was designed as a compromise between capacity and comfort. So when you haul heavy loads or pull a trailer, the rear springs can be pushed to their limit resulting in excessive bounce, sagging ride height, and an overall feeling of instability. This air compressor controller system is designed for universal use with trucks, vans, and other vehicles equipped with air springs when your truck carrying a heavy load or towing a trailor. The system can inflate and deflate your air springs in the cab and help you enjoy a smooth ride.