Ive never had issues at any Walmarts, although some in the city have the height barrier as they dont want trucks parking on the lots...but most are welcome to me.....I make great security myself as Im always sitting up watching the crazy pajama people come and go...Ive found if you park in the off far sides etc they never bother you, and most Im shopping in late anyway....gotta find some pajamas to wear and blend in with the locals and stay Undercover.
Only one time near Atlanta did I have a car pull right up next to me, and I mean CLOSE...I sat and watched as the guys girlfriend did a favor for him...and about then I started the truck and scared the bejesus outta them....LOL