Hello.
I've got a '84 Dolphin and tried for weeks to get someone to install air bags to my tired springs and take out the sag in the rear. No one could find air bags that would work on anything older than '86. I was refered to a buisness that builds off road vehicles in Four Corners MT. and this guy installed Timbrens where the air bags would have gone. They are a solid rubber support(no air). No more sag, sway, and the RV corners awesomely!!!! I hope this info is of some help.
T.A.J.