This is one of the most entertaining threads I have ever seen! Having seen some of the people at Walmart at 3:00 am - I can say I would never leave any car of even modest value in that parking lot. It could get jacked by crack/meth users in some places. Or simply towed and impounded. Take the Uber or other car service from your home or a place where you can get without leaving your car. Or, do secure long term airport parking, again depending on value of car.