If the GFI has a little led on it and it is flashing then it needs resetting, if it is flashing and warm there is a possible problem needing investigating. If no light there is no power to the break and thus the other plug ins.
Check the breakers and fuses. I say fuses but most RV, fuses are no just for 12 volt except the big fuses if you have any.d
Most new GFI have no light making it somewhat difficult to fin problem sometimes. I have been looking for some with the lights for the home.
RVs have two GFIs; one usually in bath area, and one in kitchen area.
I know you already know it though.