Can you overnight park here?

Yes

Yes you can I have parked here overnight in the past and I had no issues I also worked for Walmart and I believe that this is a safe place for you to park overnight without having to ask for permission. My understanding all Walmart allow people to park overnight.

As long as your no a semi

Trying to get my job back

Yeah

With permission I believe you can

With permission I think, it used to be that way