Scott, you were right about the breaker. I was at the trailer and found a 30 amp automotive type breaker between the converter and the batteries. It was just above the transfer switch. I took it out, and printed on the side was "BUSS CBC-30B 12V J38 30A".
My next question for you or whomever might have an answer is whether it is okay to replace the 30 amp breaker between the converter and batteries with a 50 amp breaker? My trailer has a 30 amp system, and the main 120 volt system breaker has never tripped (even on shore power). So I am surprised that my 2800 watt Yamaha Generator has the power to trip a 30 amp breaker, but my understanding of how this works between the 120 volt generator and the converter's 12 volt battery charger is pretty limited.
JRMunn