-- Last Updated: Mar-18-13 10:13 PM EST --
You might consider a trailer/tow vehicle setup as a possible alternative. I have a 1974 Trillium 1300, an all-fiberglass 'egg', that I tow with a Ford Ranger. When I get to wherever I'm going, I just unhitch, set the trailer up, and can use the truck for running around.
The fiberglass eggs are great, imho...no leaks, and very little to cause much trouble, even in the older ones. Mine has a small fridge, a stove-top and a furnace, all of which run on propane, and a porta-pottie for rainy night use. After decades of camping, the Trillium is like a luxury resort..lol... You can also get larger ones that have toilets and showers, etc. Some other brand names are Boler, Casita, Escape, Burro and so on.
Here's a link to FiberglassRV, a great website that has more info about the FG Eggs than anyone will ever need. very, very knowledgeable and helpful folks...worth having an 'Egg just to enjoy the site...