I suppose it would be like RV parks in a superficial sense of vans parking and paying a fee. However, I would suggest catering to car/van dweller minimalists, that don't have the features of an RV, by offering high quality, useful amenities. I would also take inspiration from maker/hacker spaces for more value-added options.

Really maker-spaces or artist loft warehouses could fill most of the need if they had enough parking and tweaked some things.