I would consider that rear setup very poorly thought out.
http://i1020.photobucket.com/albums/af322/dreasoner/bags2.jpg
Heim joints are not designed for side forces like that. The air bags are also in the wrong location. The air bags will have to exert three times the pressure than they would if they were on the ends of the trailing arms.


'67 GMC 3/4 292 4spd