One thing I found when running an Absorption fridger on the inverter (That is an option in this RV) is that the alternator does not provide the house batteries with enough current to maintain them at that high a load. Sorry.
Most RV fridges are 300-400 watt on A/C (And I also have some parasitic loads like the TV/Radio/Sat receiver (no more) and so on) The alternator could not keep up. Run it on propane and be happy
Residential run 100-200 watts now days That it can handle.
Or a high effiency (50 watts and it runs on 12 volt).