On a serious note: proper housing is a bit more than a bed. You need good ventilation, heating or cooling, a toilet/shower, etc...
But "a car" isn't the solution. I've seen some very nice looking van conversions that look merely cramped, but at least manage to fit in a proper bed, a food preparation area, and basic hygiene stuff like a toilet.
Likewise for actual houses, "sustainable" isn't the same thing as "small": The new house I live in in Berlin needs around half the power to stay warm as the apartment in the UK a third its size that I rent out.
This means the one I live in stays warm from (as an annual average) slightly less than the body heat of the two occupants.
I think we're not tackling the root cause in this whole discussion. People having to bottom their lifestyle because of debt.
A lot of debt is avoidable, for example student debt, if you live in a country with a well built education system. Owning a house could also made be more affordable.
It's a pitty that in the US half op people still seem to be voting for the most capitalistic side.
Its totally feasable in an emergency situation or if you just want to live like this.
But otherwise? its not okay. Peple want save spaces. A toilet at night, a bed. And not random poeple looking into your car and not shitting on the side of a street.
Edit: I agree single-family homes are insane, the solution is affordable apartments close to transit, not the rugged individualism of people living in cars.
Where do you want to draw the line between "everyone needs big properties" and "living off your car should be considered as adequate housing"?
[1] https://www.un.org/en/about-us/universal-declaration-of-huma...
People don’t want to be in an empty house in a cheap place, it’s cheap for a reason.
Nobody wants to commute 3 hours to work. And nobody wants to build an office in the middle of nowhere. The end result is obvious.
Also, Americans as a whole are allergic to affordable housing. A commie block or two could solve this, but we're still making "luxury" two story apartments out of glorified popsicle sticks and vinyl.
And, uh, the only resource that "big properties" exhausts is density. If you don't mind having to drive half an hour to get to town, there's plenty of room.