As enblethen said, this is very do-able, but with a warning.
Set up the 6-15 to 14-50 (wall plug to RV) adapter and then go into your AC distribution panel and open the breakers for everything you don't need to leave powered up. That will be at least:
Power to all A/Cs
Power to the water heater
Galley power (Microwave, coffer maker and what all) If you can't separate these, PLUG THE plugs.
Be sure to leave power to the reefer and the converter.
It is almost a given that someone will try to use something that will pop that breaker if you leave power available.
Matt