I had this problem with a previous motorhome. Unplug the refrigerator and reset the GF. If it holds my guess it is in the refer. If it still trips the problem may be tied to another source. Most of my motorhomes would wire in other outlets on the same GF so if it tripped a couple other outlets would go off line as well. If after unplugging the refer and it trips again search for 1 or more outlets that don't have power. Unplug everything plugged into them. If you can get your GF to hold you can re-plug the loads you unplugged 1 at a time until you can find the problem. Good luck and post back on the solution to your problem.
Don & Bev Morgan Weyauwega WI, 05 Itasca Horizon 40KD, 400 HP Cummins, Delorme GPS LT 40, Toad 07 Saturn Vue AWD, Air Force One, TST 510 TPMS, Mayor of Weyauwega 2007 - 2013, Waupaca Co Board Supervisor 2010 - 2014