I'm guessing it shouldn't be too hard to pin point where the AC current is going to be coming from.
My first thing would be to throw the main trailer circuit breaker to OFF before hooking up which means about the only thing you would in the mix would be your surge protector or possibly the 120VAC transfer contactor if you have an on-board generator setup..
Not much else would be in the loop other than bad shore power cable and or connectors..
If things come on up normal doing this then you can have all of the 120VAC Circuits in the OFF position and start with the main breaker first then turn ON each of sub breakers on until one trips your house breaker.
You would think an overload on the trailer side would always trip the trailer breaker first but that sometimes is not always what happens. It could be your house breaker for the trailer circuit is going weak as well tripping with a smaller load then it should.
On the trailer side the on-board converter can offer a pretty good load to the main breaker if you catch it in the boast charge mode when initially plugging into the house. Hot water heaters and other large current units can also play
games with you...
You just have start bringing thing up one at a time until you find the problem
Roy Ken
