Hitch lock,lock for the motor, lock lugs for tires including spare.and when its in my driveway i always make sure 1 of my 2 vehicukes is always parked in front of it.Also, i have nosey neighbors who are ALWAYS peeking through thier curtains to see what i'm up to.I always take the trolling motor off, and my gps is quick connect and i always remove it.
Not much else you can do