Jody,
I am NOT an expert when it comes to air ride products, but I have spent a lot of time looking into these systems.
Air ride has the double adjustable shockwaves. I think, I am NOT sure, that with this setup you can set the ride height to your liking and adjust the shockwaves firmness with the little knob.
http://www.ridetech.com/productinfo/shockwave.asp