I would suggest that if parking at home you have a proper 50-amp 2 leg receptacles installed for it. Not only will you be running the fridge but will also need power for battery charging and even supporting other small loads in the rig. Besides the basic power availability, a proper receptacle circuit also ensures safety for equipment grounding and allows for use of AC and heat, everything at will. Even a 30-amp single leg is a compromise situation. Yes, many have gotten away with the adapters. I know a few that did not and the results were not good. If you must, make sure that 20 amp is a dedicated circuit and is not part of a receptacle path with outlets before it.
At the risk of being obnoxious, consider the cost of having the circuit installed as to a tank or 2 of fuel. Fuel cost alone nearing $1/mile and genny near gallon/hour. RV's in storage often do not have options. For at home, the receptacle is a very good investment. If you really can't afford it, maybe this RV is not the best idea.