I used Ride Rite by Firestone. I rebuilt them and ran new 1/4" air lines to the rear. I left the leveling valves in but disconnected them.The Valves have a up and down button with a gauge next to it on 4 independent valves. Each has a supply line and an exhaust line. No electrical just 2 for the front and 2 for the back. They are connected directly to the air beams. Each side are connected together with 2 bags each. You can lift or drop each corner or drop the rear all the way down and lift the front all the way up etc. Slow to fill at first after dumping all the air but keep them at 80PSI front and 90 back when driving. When parked does not bounce around, but then we are to old to bus cage fight, LOL

Dave5Cs