This will get much easier when robocars come out. You won't have to worry about police and zoning laws, the car can move every once in a while or continuously be moving. If robocar renting takes off you don't even the cash up front to pay for one. Showers and toilets can be separately moving robocars so this can all be done in small vehicles rather than large RV's. The fuel would electric (robocars recharge themselves from electric gas stations) so the costs of all this would be minimal as well. If this all plays out well, apartments, and even houses should see a drop in value (a good thing because too much of wealth is being plowed into the unproductive economy of land owning - it can instead shift to purchasing engineered products).