There isn't an RV compartment, door or window that can't be opened with a sturdy screw driver........that is why we have a FT'rs home insurance policy.
The other measure we use is 'introduce ourselves to neighbors' when we get set up in any CG. Friendly chat letting them know who we are & if THEY need anything just holler.....'neighbors' seem to look out for each other
I didn't worry about thieves when we lived in a S&B and I'm NOT going to worry about them or a lot of other stuff while FT'ng.
Life is too short to waste on worrying about what cretins might do.