Apparently not legal in Las Vegas, either.  They want to steer our $$ to
the casinos.

Karl Wolz

While I think this is true for the retail chain allowing travelers to
discretely spend the night in their parking lots, sometimes the local
ordinances override the store's hospitality. I know the Pismo
Beach/Arroyo
Grande,CA Wal-Mart would be happy to host, but local gendarme keep the
campers rousted and in the direction of for-pay facilities??

 Any Walmart parking lot, You'll see a lot of RVs staying the night at
Walmarts for free>>