Thanks,
I will try to get an adapter and outlet tester today. It is the 30a house breaker that trips. It is a GFCI circuit breaker. The second electrician turned off all the breakers on the trailer reset the house breaker then turned them on and off one by one. He said there are 3 separate breakers on the trailer that cause the house breaker to trip. When I use an adapter with an extension cord to plug the trailer in to the bedroom outlet, which I did so I could run the water pump to winterize the water system before it gets really cold next week, nothing tripped and I was able to get that job done. My other problem is that I left it plugged into that outlet for 36 hours and it did not charge the battery. So I've had the battery hooked up to my dad's charger and will check that today.
Thanks for all your help.