Check the basics first. Are there any other 12 volt items in the trailer that don't work?
Possible blown bulbs in the lights? Separate switch in the bath for those lamps? Maybe the wall switch is on, but not the switch on the light?
Radio may have a separate inline fuse behind it, or the radio went bad?
Just tossing out some other possibilities to look at, if you haven't covered them already.
If you're going to "regret it in the morning", sleep until noon.
2012 Jay Flight 19RD
2016 Ford F150 XLT 2X4 SC 3.5L Eco Max Tow
2010 Tundra TRD DBL Cab (Traded)
2 new fluffy Corgis, Bayley and Stanley