I would assume that Walmart corporate would rather a large expensive motorhome with retirees who spend money at Walmart more than someone living with their passenger car filled with junk with just a drivers seat partially open to operate the vehicle. I think with many new to being homeless they do not know how to let go of stuff & have a tough time differentiating what should be saved & what shouldnt. I see the same type of behavior with those who horde their treasures in shopping carts. I assume that the discretion comes down to an individual security guard & how he feels. I bet that certain vehicles get targeted where others are never bothered. Image is everything at times, & as always I believe life is easier if you fly below the radar.