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Are you plugged into shore power? And do you have a small digital multimeter? That would be very helpful here for some testing to track down the problem. About $20 or so at most hardware stores. Easy to use and I can direct you in some testing. All follow ups are included in our fee. No time limits.
Most trailers don't have a disconnect switch. There is a shortstop breaker on the main 12 VDC positive lead and you should check the fuses in the load center for the converter to be sure they aren't blown. That would keep you from getting power. See the attached photo link for a shortstop breaker. Black button needs to be reset sometimes. https://www.bing.com/images/search?q=shortstop+breaker+photo&id=8D4939A7F0965679E3E29C89B963B0D9C24CDC15&FORM=IQFRBA
Inside along the floorline. Where all the fuses and breakers are. Didn't they show you anything on this?
Great! Have a small meter and a 12 VDC test light in your tool kit. Very helpful in these cases. And find the shortstop breaker. Guaranteed you will trip it at somepoint.