Chambers, 30, and Reinish, 27, now own an immobile home and rarely use the caravan. They've added a gas stove, though, and plan to install a composting toilet, a heater, and insulation to provide friends a cheap, cozy place to crash. They also intend to post full construction plans online. "We find a lot of people are interested, but they're intimidated," Reinish says. "I can relate to that. I remember thinking, 'Is this going to fall apart the minute we hit 55 miles an hour?'"