You can buy the WalMart Atlas at about any WalMart. It will show the addresses of WalMarts and if they have fuel etc. About $6.
I have not had one that tells if you can stay overnight. That may be something new. Most of the time it depends on the local ordinances and the neighbors. Sometimes even if there is a sign some will stay overnight and nothing happens. I always try to honor their wishes if there is a posting. I have even been offered a hookup to their water near the garden dept. That was an exception.
Joe
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