Stayed overnight in my car. Signs do say no overnight vehicle or RV parking allowed but there were 2 semis, 1 van and an RV staying overnight.

The White Zone Is For RV Parking

Despite the signs saying no overnight parking, overnight parking is allowed away from the store where the white lines are. Well stocked store, water refill for jugs at back of the store. Enough restaurants in the area to satisfy any taste. But traffic can be a little hectic.

4-1-19 They allow overnight parking and it was the quietest Walmart we've ever been to.

Parked by La Fitness for one night with no problem.

Vegas Resident

I stayed in my truck camper .. Got there at 7 pm left at first light .. No problems .. 2 more large rigs there when I woke up at 4 am. 40 plus feet long with toads.

Overnight Not Enforced

Saw about 4+ RVs in the parking lot overnight so no enforcement of rules here to stay overnight.