Welcome to iRV2.
Sorry your first post is about problems .
If you trip the GFCI that you've found , do the remainder of your outlets quit working ?
Does your power panel ( 120 volt breakers ) list two C/Bs for outlets ?
Is your RV equipped with an inverter of any sort ?
Have you looked at the fridge and microwave outlets , to see if they're a GFCI?
If you trip the GFCI and nothing changes , then you'll need to disconnect from 120 volt power and remove the GFIC from the wall and check the wiring connections , it's also possible that the outlet is working but not allowing any power through to the " Load "side of the of the GFCI.