Is it allowed to overnight here?

Yes

I would find elsewhere to park for the night.

No . Most business will tow you . Be careful not to get towed

No, Walmart has publicly announced that they no longer want any overnight parking in their lots.

There has never been overnight parking allowed. There are signs as you enter the parking lot that clearly states No Overnight Parking

Yes don't be a Drowsy Driver ... Again yes ...si se puede

No overnight parking. It's regularly patrolled by police.

No we do call the police.

No is not u will get towed!! I was a supervisor I would know overnite tow trucks