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My 2012 Ram 3500 4×4 has a Tiger CX RV coach frame mounted. It weighs about 3,800 lbs. with 11,000 total. The builder(Provan) installed air bags on the rear. The suspension was very bad form new. Front porpoised up and down, rear had no travel and wallowed back and forth. I removed the air bags, installed a Hellwig Bigwig and added a leaf to the rear along with Rancho 9000xl shocks.I installed Bilstein 51000 reservoir shocks in front. Very good improvement,for a while.
Rancho’s 9000xl shocks started out better than OEM’s with 10,000 miles but are shot with only 12,000 miles.No leaks, just weak as mush. Bounce up and down 3x after bump.
Bilstiein’s have 22,000 and have deteriorated to the point of factory OEM’s and porpoising.
The small piston truck shocks just work to hard on our truckcamper rigs. I’m looking into larger 2.5 series shocks like King, Fox and RoadKing.The larger bodied shocks can handle stabilizing the weights easier. They cost a lot more but it’s easy to see they are much more and rebuildable.

2012 Tiger CX Ram diesel 4x4