If one were to park ("Camp") overnight and were confronted by a security
guard I wonder what would happen if one said they were waiting for the store
to open to do some shopping. We need supplies, right?

I would guess that anyone who camped out in a Walmart shopping area did
indeed go in to shop for a few items before they left the next day. Am I
right? I would certainly shop before I left even if only to buy food or ice.

William