Yrs you can
I would ask the manager of the Walmart you want to stay at. Most won't mind a night or two, but some don't want any overnight parking and you'll be escorted off by police. It depends on the Walmart, their policies and the laws of the city you're staying in.
Well...hey, just do it. I've heard you have at least one night and nobody will mind. There's plenty of room to the west side of the parking lot
I have seen people doing it so I would assume yes
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