Never anything stolen from a campground in MI. But rest stops always seem to have a few strange people hanging around for one thing or another. Years back I had a couple guys creep up to our fiver and dually when we had it. The dog alerted me to them and I turned and looked. They were coming up from the side and slightly behind me while sitting in the drivers seat waiting for my wife to come back from the restroom.
The dog barked at them and they turned around and walked away after I saw them. So now I always have an eyes looking everywhere. But we can use the on board bathroom now so no reason to leave the rig.
Our storage yard has had RV's and Travel trailers broken into more than once. Had a fiver at the dealer and the lot got ransacked one night. Tried to get into ours but must have gotten scared off, just damaged the lock