What did you leave on ( 12V) in the trailer? If the trailer battery is dead and you plug it into shore power, the fuses in the converter ( Reverse polarity fuse 30-40A) will blow as the initial current into a dead battery can exceed the fuse rating. I suggest charging the trailer battery with an external automotive type charger before plugging into shore power. You may also want to add an ignition activated relay to the 12V aux line in the Jeep so that the aux line is only powered when the Jeep is running.
2015 Freedom Express 248RBS
TV 2015 Silverado HD2500 Duramax
TST Tire Monitors
Honda 2000I + Companion
2 65W solar panels