I put 9000's on the back and 5000's on the front of a 2015 Ram 4wd (with Rancho's engineers blessing). with camper on, even with socks on stiffest setting (I tried many settings) I would hit this dip in the road and the rear of the truck would start to oscillate and only way to stop it was to slow down.
Rancho said the rear ones might be bad so they replaced them. Same problem with new next rear set. So I returned them all under that 90 day free ride program.
I put the stock shocks back on and left it that way.
I also noticed the 9000 did not extend themselves if you compressed them, you had to pull them to extend them (but the 5000's did). I seem to recall when I questioned this they said they were not gas charged. But now I see on the website that are gas charged so maybe they redesigned the 9000's.
also many people said that to remove the adjuster and grease it as thy rust shut over time.