https://rallypointmc.com/
Yes, for as little as $200K you can live your Dan Tanna fantasy and park your car in your "living room". For those of you too young to remember, Tanna (Robert Urich) was a private detective on a TV series Vega$ who famously parked his vintage Tbird in his man-cave condo and had an ex-Vegas showgirl "girl Friday" he hung out with along with a goofy right hand man (Bart Braverman).
Back to "reality" in Hendersonville TN, storage units have running water, bathroom facilities and provisions for a kitchenette. I doubt they are zoned residential so you can't live there but you can hang out with your car and head down to the members' clubhouse to mingle with other like-minded persons in pursuit of ways to waste money.
I'm scratching my head as this looks to me like a dressed-up Self-Storage facility with a clubhouse, but judging by the % of pre-sold units, I guess the rich need something else to waste their money on.