Even if your trailer and fridge are level when you have the entire rig level when parked does not prevent it from being too far out of level when traveling, such as driving on high crown roads or climbing or descending long grades, especially in hot weather. For the past two years, we run our fridge on propane only, at the suggestion of Paul Unmack, the owner of ARP RV refrigerator protection controls. He said that propane does not shock the steel of the fridge boiler like electric does. When cooling is called for, propane brings the steel boiler up to temp slower than the instant heat from the electric elements. We don't see a big increase of gas usage either. We also installed his ARP device along with the extra fans, and this was after having the cooling unit replaced for the second time in less than a year. We are at four years now since the ARP device was installed, and the fridge is still working great. I have no interest in his company, except for having one of his devices installed.
https://www.arprv.com/
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