Correct-o. Even in a 5 star park in the mountains with security forces; we have had instances in the "storage" area in the flat cut area; where 50 units are stored when not used; people come from the woods; open locks and steal flat screen tv's and personal items.
You can only do what you can and then enjoy.
Most newer "storage areas" that charge monthly fees have many security cameras that film from all angles. Theives know this. Helps some for sure.