I had a 2004, 34' Fleetwood Terra for about a year. I park my coaches on the side of my house that is about 5' higher than the street. I had rear end drag issues trying to back up the ramp into my yard. I added the Ride Rites bags to the rear of the Terra. Since I needed to add air to lift the rear every time I came home, I added the compressor. Having the ability to level or balance the coach from a button on the dash was very handy, especially in my situation. As an unexpected bonus, the coach really handled better with the air bags.
As a suggestion, you might want to just add the compressor to the rear bags. I think once you set the front bags, they will need very little adjustment. By having the compressor on the rears, you can adjust for loads by both side to side weight and trailer weight.
You can always add the compressor at a later time to the front if necessary.