On a recent ride from Gold Coast to Cairns, I met a chap and his wife (in their early fifties), who live full-time in their "Fifth wheeler". a huge thing towed by a massive Dodge ute (I think it was a Dodge). This thing has all mod cons, including a garage in the back with a ramp that allowed him to ride in (and back out) his Harley (poor choice of bike, in my opinion, but I wasn't going to say that to him though). This van was based on one of those huge horse floats. Oh I was very, very jealous, I can tell you. Down side was he has around $220,000 dollars tied up in this machinery, although that is a lot less than most Australian real estate. They have no other ties and just keep moving around from free camp ground to free camp ground.
I think the Americans call them Toy Haulers. A good name.
I could imagine myself doing that...but my wife shudders when I mention it. Pity