We use ours frequently and leave it plugged in. However, in your situation, I would turn it off at the circuit breaker panel and leave it propped open (assuming you don't enjoy cleaning mold). Make sure you block it, so it won't accidentally close. It will not negatively affect your fridge to leave it off.
Also lift the arm of the icemaker so as to stop the water flowing, should it go crazy. Also leave the main water pump off to keep pressure off the plumbing.
2003 Alpine 40FDTS (400HP)
Long Beach, CA