Electrical on these darn trailers can be tricky and a real pain at times. Mainly because it seems like who ever is doing the job at the time does it his way and not necessarily by code. Plus it's usually impossible to find a wiring diagram.
They seem to put a GFI by, or close to all the water outlets, sinks etc. You might have one more there than what you have found. Also, I see your fridge in installed in a slide. Check underneath that slide for a junction box. If there is one there open it and check for moisture/water. They are notorious for getting water in them. While you are in there, make sure all the wire nuts are tight and all connections tight. When you close it back up, seal it with silicone to keep it dry.
I'm not saying this is your problem, just giving you things to check that I've seen in the past.
Good luck.
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