Walmart Overnight Parking??

I stay at walmart a lot probably at least 20 nights a year. Also good sams, rest areas, truck stops, local airports, swap meets, race tracks, blm land, anyplace I can sleep. I spent 4 days in the municipal parking lot in Monterey, backed right up to the pacific ocean. I am in a truck camper, but I don't usually go camping. No sitting around the campfire, 40 feet from my neighbor. I live in the woods on a large secluded acreage, on a lake. We hunt and fish and have campfires here. I travel to see what's out there, (like mansion tours), to attend events related to my hobby (old cars, racing), and to escape winter. So campgrounds are an inconvenience. If I go to a beach area, and I am not allowed to camp on the beach, or park overnight in the beach parking lot, I'll get to the beach parking lot as soon as it opens in the morning, and get the closest spot to the beach, with the right side towards and area where no one else can park, so I can open the slide at least part way. Then after sunset, go to a restaurant or a movie, or occasionally a bar, then walmart or one of my other spots, then back to the beach in the morning. Same thing for many other attractions. It would not make sense for me to enter a campground at 9 or 10 every night and leave at 7 am.