Clarence Thomas--yes, that Clarence Thomas--loves to hit the road in what he calls his "condo on wheels." Shaquille O'Neal bought his own mobile McMansion last summer, a 37-ft. Fleetwood Discovery, and he didn't even need to supersize it. And in January, after finishing his second term as Governor of Maine, Angus King set out with his family on a five-month cross-country odyssey in his big Newmar Dutch Star, which in place of a rearview mirror has a dashboard video screen hooked up to an aft-mounted camera.
Recreational-vehicle sales are booming, and the appeal of RVs is much broader than in their...