Glad I ask the GFCI question.
Some things that sometimes upset a GFCI
1: The patio outlet (Should be on the RV's GFCI) sometimes fills with water and trips up-line GFCI's (This normally includes the one in the RV's bathroom but hey someone may have wired it differently)
Heaters, both the fridge and the water heater, Sometimes the insulation on the element cracks and a partial short happens.
Converters.. SOME will trip a GFCI if the batteries are full up, Some if they are run down, Some seem to do it all the time, some never .
So give us the list of breakers that trip the thing and we can help you farther.