Sorry to hear about this. Was the shore power a GFI? If you had a dead short inside your trailer one of your breakers would have tripped for sure but it sounds like you have a similar problem to what we experienced a few weeks ago. We had an identical issue come up three weeks ago after really heavy rains one night-went out next day and had no power to our garage. Unplugged our 69 AS and reset the GFI breaker in our house panel that controls the garage, re-plugged in the AS and it happened again. I narrowed it down to one of our 4-circuits.
If the power supply had a GFI, which a lot of newer campgrounds do now, you likely have a leak somewhere causing a voltage change which would set of a GFI. The sure way to know would be to plug into a non-GFI'd breaker and turn the one that gives you problems on again and see if you noticed all your lights dim inside your trailer. We're still waiting for that circuit to dry out and have not been able to do a work around quite yet. My next thing to do will be to look into the wiring diagram of the 120V plugs and try deleting or unplugging each one in the line from the last to the first-that way I can narrow down which one or ones are causing the problem. in our case it's only the 120V outlets in the kitchen and front area living room-bedrooms and AC and bath still work fine. In our case we think the scare light was leaking which is directly above the outlet on that wall and when I opened up the 4 outlets on that faulty circuit two had moisture in them. GFI's are very sensitive to any voltage changes so they trip much easier than a normal breaker. Sorry I don't have the exact solution but hopefully it'll help.
WBCCI-6849 . TAC OH-22
It is impossible to achieve the aim without suffering-unknown source from a Robert Fripp album-