I am lead to believe the bilstein 4600 is the shock with correct full extended length for the given application, and the 5100 is 1" longer extended. but both have same valving.
Many like the Rancho 9000's, but have problems with the adjuster seizing up.
I tried them on the back of my new Ram and I felt they were worse loaded than factory shocks (truck was brand new). they sent a set of replacements but they were the same so they took them back and I have been happy with stock. If I later decide to change shocks (only 14000 miles on it now) I will go with Bilsten 4600.
I did add a Big Wig sway bar to back of my Ram. I had sway bar before I bought my current camper so I can't tell you about the difference.
I did find on my Ram that even though 65psi is correct pressure for my weight on rear tires, I raised that to 70 and he helped with the ride.
you really need to put your truck with camper loaded on a scale to see what your weight is.
are you using an air line for each air bag? if you have one line for both bags with a "T" in it, air will transfer from bag to bag as you go around a corner.
