The '07 Essex comes standard this year with a new feature rich air leveling. As well as leveling the coach for parked position, I believe it can be used for elevating front, back or all while driving.
Bob, can you read the manual, as I can't get any operting instructions on the web, and let us know what else it does?
I started a new thread as yours is getting quite broad in topics.
Peter - Doctor of Mixology