i keep swaying towards a custom deaver pack. less issue with dealing with worn out hiem joints, then just fab up some long travel air bags or make them collapse able/quick release when not towing. Hopefully its good news!
I've thought the same as well but my springs are still somewhat stiff when empty but they do sag pretty good when I hook up my 18k lb rated trailer with a ZJ Jeep on it. It definitely needs bags for towing with the springs I have. One thing I like about the full air bag rear is the adjustability of height to hook up the trailer without having to crank it up. And softer ride too.