Outlet is supposed to trip, when you press the test button
If gfi trips when plugging the trailer into inverter via cords and adapters, there is a power leak to ground, like an electric heating element
Or do you mean inverter overload trip
Overt load mad too much stuff using inverter power
Be sure fridge is on lp unit on automatic,
Wh soon lp for off
Converter turned off, no such thing as free power, charging your batteries from your batteries, it's just one big power drain loop
It's a common thing to forget about power hogging drains when first getting an inverter