All I can say is get a list of the RV dealers that can do warranty work along your route. Much easier to search it out while at home, than on the road.
I guess I am not to optimistic that the dealer or anyone will figure it out before you leave. My best guess is a pinched wire, that while moving down the road shorts to a screw going into the wall or cabinet someplace. Yet it tripping twice while parked and still - does not make much sense now.
My guess is the dealership already looked at the circuit board, and also checked the amperage to that board. Probably less than 1.2 amps under normal loads.
Also check the light bulbs, they can also draw more power too.
Fred.