tough to have something like that car and not have your own property - people tend to think that because it isn't parked on someones private property they can *** with it..
I wouldn't be worried about anyone messing with it. You have to pass thru a manned gate to get in. I could leave a laptop on my seat, if anyone noticed they'd probably just think, man, that's an old laptop!
But I would hate to leave an nice old Mopar out in the rain all the time.