Be aware that the fridge on many coaches, like ours, isn't on a circuit that works off inverter power, if that's relevant to your question. It will run on gas, if it's turned on, or 110v AC power via park or generator source, but not off inverted power because of the potential high battery draw-down.
That's why you may find the main fridge breaker or fuse is in your 50 amp panel box, rather than the subsequent 30 amp breaker panel box, because the inverter feeds off the 50 and then into the 30 amp panel.
Joel