Hell, Wal-Mart actively (though quietly) promotes itself within the RV community as a place to crash for a while. In the areas of bigger cities they tend to ban it (because they accumulate permanent parking lot residents) but in most parts of the country you are perfectly welcome to park in their lot and crash for a day or two. As long as you don't misbehave I'd be really surprised if they really care if you're actually in the store for a couple days.
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