I have a 2022 Grand Design Momemtum fifth wheel toy hauler with a residential refrigerator. The camper is 50 amp but I have a 30 amp service at home to plug the unit into to be able to run the refrige...
Sounds like you have a multi-wire branch circuit with one leg to RV and one to outbuilding. This is not good. If some of the outbuilding is on RV leg it could be overloaded. Installing a30 amp dedicated to the RV receptacle is best solution. Make sure the 30-amp TT receptacle is wired 120 volts and not 240!
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