I was looking for the same thing about a year ago. My only considerations were that it was roomy enough to sleep 2 adults and got the best mileage possible. I settled on a first generation Honda Odyssey. I had to build a subfloor in order to get a flat sleeping surface, but on a 9300 mile trip through Canada and Alaska last summer, I averaged 29.6 mpg. It comes with a 4 cylinder as opposed to most minivans that have 6's, but even so, the mileage surprised me. I get about 23mpg just driving it around town. Certainly an Aerostar or Astro will have more room, I considered a Windstar for that reason, but I'm more than happy with the Honda, and would buy it again. I'm not sure if you would have enough space for year round living, but you could always tow a small trailer, like a 5x8 enclosed construction trailer and it would be more than enough for one person. That's my eventual plan when I go full time.<br />Norm