Walmart parking lots are not campgrounds. It does not matter whether you go in there and spend money, if you plan to stay overnight, park as far from the store entrances as possible. Even if the store has closed and you are the only vehicle in the parking lot, park away from the entrance.
People Also Ask
There are many homeless and/or unhoused people who still need to buy food, clothing, and other supplies, while they are living out of their vehicles. Wal-Mart allows overnight parking, with the discretion of the local manager and the cooperation of local ordinances, for one simple reason: Money.
The freedom of a rooftop tent is liberating. You can camp anywhere you can get your car, be it a campsite or alone in nature. It is not always certain where you will be spending the night on an adventurous road trip. Will you head for a campsite, or would you rather camp wild?