You would be surprised at the number of thieves who drive around neighborhoods shopping so to speak.
It's a pain to have to wait until early morning to load up my kayak and gear before daylight....Those days of loading the night before are gone forever.
Jimbo, this is likely the safe thing to do.
Remember, though, that monofilament line is cheap and hard to see at night. I suppose one could easily rig up a trip wire that'd knock down a bell. I even have instructions on how to set a trip wire up so that it turns on an alarm or something.
Anyway, it'd likely work to run them off.
So many of us like to get all the rigging done, everything loaded the night before so we can take off in the dark in the early AM and be ready to get on the lake right before or at dawn.
Brad