Had a similar problem where plugging into any 20 amp CGFI on the house popped it but regular connection was fine. Also had slide receptacles not working. Never got definitive answers or figured out exactly what was going on but suspect there is a connection (or failed connection, lol).
I did discover through exploratory surgery that receptacles and wire connectors in these units are quick connects which can fail totally or intermittently but look OK. There are also connection boxes in odd and nearly impossible to get to locations.
I'm looking forward to more group wisdom on this thread. Sorry I don't have an easy answer.
2015 Crossroads Cruiser Aire CAF27RL, 2018 F250 diesel crewcab SRW 4WD short bed, Trailer Saver hitch with Reese adapter on Ford OEM underbed 5th wheel connector.