leeniea, as I understand it, signs like that get posted in areas where there is a town ordinance against the practice, and the signs may be new but the ordinances and store policies are not-- people who have docket at Wally world have advised, always call ahead for local store policy.

To respond to Boab-- Some folks do it not in their van, as I do, but in a full-scale RV. And no, it isn't really "camping," when it's done on the fly for a night or two along a long route. What you call "kipping," some call "cooping". At our house, we call those "crash-and-burn" stops-- arrive tired, crash after a boughten (not grilled) meal, set up only what is minimally needed, and depart early. (Crash = sleep, burn = burn fuel.) For a crqaash and burn, it doesn't have to be a spacious campground with scenery and amenities, it just needs to be somewhat level, and easily found in the dark.

On the other hand, people boondocking at other locations do actually camp-- set up what is needed, cook onsite, etc., for instance at BLM locales or wilderness spots, or at a cooperating farmer's property.

One approach I found interesting was, people will arrange to be "caretakers" of a vacant property for weeks or months, but instead of staying in the house, will stay in their RV or tent or combo of both. We had one housesitter, and she did a great job, but it took two days for me to teach her all the oddities of our house-- such as, the upper oven only broils, please use the lower oven, and so forth. If she'd been a camper-- how much easier it might have been for us!

~Susan