First.. Did you look around the park? I mean I was lying here around 9PM a couple Sundays ago and all of a sudden everything went dark save for the stuff that is battery powered... Seems some driver failed to notice the curve in the road so he went straight.... Straight into a utility pole.
Power in most trailers comes out of the park pedestial, then via your cord to the breaker box. Check the MAIN breakers Check the park DO NOT rely on visual turn it off and back on only way to be sure.
Then to the branches.
On a motor home with GENERASTOR usually there is an automatic transfer switch first, THEN the power distribution panel.
Many RVers have a few screws loose.. in linear order
The screws in the plug that hold the wires (if not welded)
The screws in the cord outlet (if detachable)
The screws in teh RV's Inlet (If cord is detachable
The screws holding the wires inside the Auto Transfer Switch (If you have one)
And in the breaker panel (Mine were).
I got lucky as the FIRST thing I checked when I had A/C issues, was also the last,, (The breaker box) but later I had issues with the INLET (I have a detachable cord) and a friend had ... Well the cord outlet fell off in my hand ALL SIX screws inside it were loose. Real quality control.
Oh one other suspect: IF your RV is 50 amp via an adapter to 30 amp.. Said adapter. Also the park's outlet. Volt meters and test lights are your friend. I prefer test lights.