Lots of local ordinances prohibit it. Most cops have better things to do. Nobody I know has ever had an issue. I can tell you though, if you're in a raggedy old 60's motorhome, doing the tweaker thing with 1000 bicycles strapped to your trailer, the cops are going to stop by and ask questions.
All of those parking lots are privately owned real estate, not city streets. Unless a WM customer complains to management, or an employee gets suspicious, then cops won't get a call.
2014 Silverado 2500 6.6L TD and 4X4
2011 Carson Standard Duty Car Hauler
2012 Forest River Stealth SK2112