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Hi my name is Robert..
First off many RV'S you can not plug into 240 direct, in a RV a 50 amp service is 2 120 hot legs coming in to equal 240, 240 direct can damage the appliances and converter so want to clear that up...... Robert
IF the incoming AC voltage is good then it has to be the converter or an auto breaker problem, sometimes they will put a thermal breaker on the charge line to the converter, as a general rule it would be 18" from the battery, sometimes they can get corroded. When they heat up they break contact, when they cool off they self reset, I have seen techs replace converters when the breaker is the problem.
The converter will be part of the main breaker/fuse panel OR stand alone and plug into an outlet, the stand alone can be about anywhere, under the fridge, stove, behind the breaker panel near the entry step or by the batteries. IF it is outside many times you will see a vented panel. Try and follow the battery cables and see where they are going into the RV if possible.
IF you have more questions or concerns please feel free to contact me... Robert
Also on that breaker you would want to see the same voltage on each post, if the voltage is cycling on one side and not the other it is the problem, you might also have more then one so if you see any check for voltage to ground on each post. Robert
Hi was just checking in to see if my answer helped??? IF you have more questions or concerns please feel free to contact me..