I think the wm by me stopped allowing overnight as well. It's always been an ordinance just never enforced. Wm camping isn't my bag either but I could see it as a quick overnight. I think the issue at the wm by me was the garbage being left. Probably more the truckers than campers, as it included the usual jugs of urine. It was getting pretty seedy looking in the area of the lot overnighting was allowed, so much that I asked my wife not to use the entrance near there. Again, while I can see some overnighting in a parking lot, good riddance to it happening in my neighborhood.