In my country the national postal service offers locked PO boxes for a very small fee, and it's fairly normal for even people who have a street address to use them to receive mail, so you could probably just do that. That said, I'm not personally partial to the "Van Life" so I haven't thought about it very deeply.
What was a pathetic joke for gen X and boomers has Millenials and gen Z thinking, "is there a van that is river adjacent?, that's more the price range I'm looking for"