Yes, I have seen a few people doing that before here.
Yes unless you don't mind the slight chance of getting harassed by the police / sheriff's. No fun getting woke up to a cop whapping a maglight on your window.
Technically it's not allowed. There are signs all over the place saying no overnight parking. I don't know if they are enforcing that after the Tubbs fire. As for safe, walmart has surveillance cameras all over to discourage crime. Historically Walmart has allowed overnight parking as a way to increase business
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