Welcome to the forums: The more info you give us the better answers you will get. Looks like a 2008 Culf Stream Conquest Ultra Super C could be on two different chassis so hard to answer your question. If it's on a IH truck chassis with 22.5 tires it will probably be OK. If on the Chevy 5500 Duramax with 19.5 tires as dsteinman posted above... probably needs a bunch of help. Test driving a empty rig (not full fuel, no water, and none of your stuff) may not tell you the truth on how it's going to handle loaded up.
Not many DP's with bunks but most DPs handle well without having to add things to help the handling.