[sourdough]

When he gets back turn off your main AC breaker and all the other AC breakers in the trailer. Have him turn on the house breaker for the trailer. Hopefully nothing blows. Turn on your main breaker. Hopefully nothing happens. Then turn on your breakers one by one until it blows the house breaker then start investigating. Make sure he doesn't have something running on the house circuit in addition to your trailer. If that circuit has other things inside the house plugged into it your trailer may overload it and blow the breaker.