In reference to the thermometer I mentioned earlier. Don't have any pics of the thermometer, & rv is at the dealer. But it 's a AcuRite 00986, made just for the fridge/freezer. Got it from Amazon, $27 I believe. You do need to use Lithium batteries in the freezer, as regular batteries don't last long. Have been real satisfied with it.
Even put the base unit in the garage this past winter, just to keep an eye on temp in rv. It was parked within a few feet of the garage.
2012 Forest River Wildcat 313RE
2012 GMC Sierra 2500 HD Duramax
Demco Hijacker 18K Autoslide Hitch
BAK Roll-X Tonneau Cover