Here's a pretty low cost idea that may save you some grief.
Get a thermometer(s) that have wireless remote sensors. Put the remotes in places that you think may be trouble spots.
IE: a compartment that has some water lines or tank, or a battery compartment etc.
With these you can monitor temps to see if you may be entering a danger zone, and take preventative measures.
It's much easier to keep something from freezing than to get it thawed in extreme low temps.
I have one I got at Kmart, one inside display and temp+ one remote for les than 20.00. It can monitor two remotes. I think there are others that can have several remotes