donn0128 wrote:
The surge from the converter is probably tripping the GFCI. Happens to me at home some times. Plug in, then reset the GFCI and see what happens.
A surge will not trip a GFCI, they are only looking at current imbalance in the hot and neutral wires.
Your RV obviously has a ground fault somewhere. When plugged in at an RV park to the 30A or 50A outlet it doesn't show since those aren't GFCI outlets. Same thing as when you plugged into a non-GFCI outlet at home. Obviously it isn't the GFCI at your house because it works fine with something else plugged in.
You do need to check the RV and find and correct the ground fault. It has the potential to make for an unsafe situation where someone could get shocked. As mentioned, the refrigerator circuits and water heater are the first suspects. Turn those breakers off and try plugging in again.