Air Lift Performance 3H SystemThe 3H from Air Lift Performance is both a height and pressure based management that features 5 preset heights and individual four corner air spring control. The height based sensors give the system the ability to automatically and accurately re level when loads change (e. g., adding a passenger or traveling with luggage). Installing height sensors is often a daunting task for the weekend mechanic, but worry not because Air Lift has designed the 3H so