The Car thing should be your fallback plan to keep you off sleeping on the street. It’s only a step up from that, and certainly not something you should be planning for. YouTube videos make it look a lot more glamorous than it actually is. I slept for a week in a van while I drove around in New Zealand. It was fully kitted out with kitchen, actual bed, power, water, the works! And a week was long enough - I would not have wanted to live like that longer term.

The dodgiest one-bedroom shoebox with a bathroom and toilet would be better than any car.