If you have a check through my old threads, my Wife and I did just that (bought, in Colorado). Things differ from state to state, I know another Paul from here bought his van in Canada and generally, that appeared to be lower stress.
You'll need to search for conversion vans - T4 California's and similar don't seem to be readily available. We bought a Ford E150 and bought camping stove etc. to use. Craiglist / Gumtree were useful.
How long are you going for as there are a few companies that rent decent options (but at a not so decent cost)?