You might try resetting the 120 VAC GFCI outlet located inside, on the rear side of the fiberglass galley cabinet. They do trip sometimes, and when they do, it's generally due to a corroded outlet outside the trailer near the lower fridge
vent, (which may also need replacing if the reset won't hold.) Often, the weather seal gasket around the outside outlet cover plate dries out, gets brittle, and cracks. This lets moisture into the outlet box which causes corrosion on the outlets terminal screws. I would just replace it outright. Don't attempt to clean the wire ends/terminals, as the will be corroded again in just a few months. I'd recommend buying a new 15 Amp receptacle and a new cover plate gasket at any of the "big box" stores. Shouldn't run you more than $5 bucks or less.
And just as a point of clarification, the fuses are only for 12 VDC circuits. All 120 VAC circuits are on circuit breakers, not fuses.