I wonder how long it will take for 'cars' to appear that are technically roadworthy but have a better layout for this kind of thing, or maybe a double decker could be converted for the purpose.
Someone figured out they could open up an entirely new market by slapping wheels on tiny homes and calling them vehicles, even if no one would ever intend to move them anywhere.
The whole thing is predatory, but it's an interesting case study in perverse incentives.