I like this quote from a movie, can't recall which one.
"It's not a question of whether you're being paranoid, but are you being paranoid enough?"
I personally would not camp in a location where I had to worry if the low hanging fruit was going to steal my entire camper. If they did, so be it. It's fully insured and was cheap to begin with... other than some mismatched dishes and pans I inherited from my folks when they passed, there's nothing of personal value in my camper, nothing insurance can't replace.