2012 Dodge Ram 3500 diesel & Eagle Cap 1160

If you're getting a truck with 4x4, diesel engine, lots of options, etc. And a camper with lots of options, and hauling 4 or 5 people and their gear I would look at a 4500 series. The 3500 will probably handle it but will be over weight I suspect. Of course, most trucks carrying TCs are.
If you stick with the 3500 you will probably at least want some good heavy duty shocks like Bilstein or KYB Monomax. Most stock shocks are junk to begin with. Other than that I'd see how it rides and go from there.

Your ram 3500 is plenty of truck for an 1160. I'd just add rubber stableloads first and that should be fine.

You might even want to go for a 4500/5500, that is one heavy camper. I'd also consider a manual too, not a fa of Chrysler automatic tansmissions. My six speed manual w/ the Cummins 6.7 will haul aXX.