Sadly, it's abuse like this - and then blatantly bragging about it and instructing others how to do it - that will eventually lead to WalMart banning all RVs from overnight stays in all their stores.
Some already do - they have bars above the entrances so a trailer can't enter. And it's probably because of this kind of abuse. That said, I'm sure some cities have ordinances against RVs staying overnight in parking lots - but it's because of stuff like this.
2015 Jay Flight 32RLDS Elite
2012 Chevy 2500HD Crew Cab LTZ (6.6L Duramax/Allison)
Equalizer Hitch (1200# bars)