No Overnight Parking

We wanted to stay there for the night, and we thought seeing 2 other suv's doing the same. There were also 2 camper vans. But then after shopping, some kind of security guy showed up and gave us and the 2 vans a heads-up that Walmart doesn't want us to stay here (but he didn't go to the other suv's...) Also we didn't see any no overnight parking signs, so you can never be too sure.... we went then to the Fort Meyers 4770 Colonial Blvd.