I am contemplating changing my 2500 over to a 3500 if it's possible, due to cost and the truck I have now has extras I want to keep. Has anyone else attempted this and if so, what pitfalls are awaiting me? It is easier to buy one already to go, but it is out of my reach for now. I wanted to upgrade to haul a 4000lb cab over camper, which is out of the question for my 2500. Thanks for any advice.