New or used?

Thank you all for your input; I do appreciate it. I would love to buy new but I don't think that I can get what I want for the kind of money that I am willing to spend. yes, I could go out and buy a $100K RV but then I would never get to build the new house that we want (working on that one also!). I do not currently have a vehicle that could tow a large trailer, we have a Jeep Cherokee without a tow package & it's a 4 cylinder so it couldn't tow much even if we had the tow package. I am wondering if we need to hold off on this whole idea now. I know someone who is an electrician and he said that he could handle setting up a battery bank for me and I found a great deal on some really big time batteries so I would love to see if I can salvage a good used vehicle. I think that I need to study up on the different kinds of RV's out there to get a better feel for what we really want/need.