It is. So many people live in vans, now, and camping sites are so overbooked, that "wild campers" are considered a plague. The police go around, at night, chasing them out of parks and off of property, and handing out fines.

If you don't pay the fines, they confiscate the van.

They leave trash and poop, everywhere, and disturb the wildlife.

it’s possible.

best bet in the US is BLM land. does have its own unique set of challenges and expenses tho.