You're telling me in the middle of the night if you wake up and have to pee, you're really going out to a bar and finding a restroom? I think not. At worst you're peeing onto the sidewalk or into a bush and at best you're peeing into a bottle in your van and then dumping it out on the street.
I report anyone I can tell living in a van on our streets to the non-emergency PD line, and they come out and they make them move.