my '91 fleetwood FWD would sag in the back when it was loaded and would run the air compressor too much. When I went to buy new air shocks they said they are discontinued and can only buy a non-air replacement. So I bought the new non air shocks and some variable rate springs. With the car empty it was lifted about an 1"-1 1/2". Look really good now. Rides a bit more stiff but handling is much better and doesnt budge when its loaded.