Walmart, due to their wanting to "assist" RVers, are becoming homeless camps. Even our small town WM has the same several cars / vans parked over on the side. I spoke with the night security guard who advised he is aware of the them, runs them off, and after a few days they come back.
Apparently they stay somewhere until the $ runs out, and then it's back to Walmart.
Perhaps WM does not want to get involved in a civil litigation of defining a car / van over night "camper" to a $ 20,000 plus RV "camper".
Homelessness , Showering, Trash and other out of the ordinary behavior will end it for over nighting for all!