Residential Fridge install question

I sealed up the outside side vent but left the roof vent open. I have camped in temps below 0 at night and not above freezing for weeks at a time and I have had no issues with the cold causing problems. Even with an exposed water line for the ice maker it stays plenty warm back there to keep things above freezing. How your coach is setup and insulated could certainly effect your results. My fridge has coils on the bottom under the fridge and I have a couple of inches clearance at the back and maybe an inch or so on each side. There is also a bit of clearance at the top but there is a wooden support that closes all but a bit of this off to air circulation so air is forced to go in the front under the fridge and out the back with no where else to go but up.