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What I am seeing here is the voltage at the batteries. You say it drops below 12V that suggests to me that the batteries/battery has about failed. Have you checked them for water since you bought the unit.
The fact the batteries are showing a charge rate of 13.7V does not indicate the condition of the batteries.
I would buy a hydrometer to test the batteries after checking the water level in them. Fully charge them and let them sit for at least a half hour and check the voltage again, Should be at least 12.8V.
As the voltage drops the current goes up, explaining the tripping of the circuit breaker, try the process with the RV plugged into shore power and see if it acts the same.
Any tech that wants to charge for 1.2 hrs to put in a new circuit breaker that should be a 15 min job is a robber in disguise.
While replacing the circuit breaker may appear to solve the problem, you need to be sure the batteries are in "good" condition and all connections are good first off.
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