Strange. Sorry have no explanation to offer you as to how all the breakers could have changed from on to off by themselves.
I would turn breakers back on and see if they hold. Converter charger should be putting out power well above 12 volts, you can tell converter charger is running and master 12 volt power switch on if you can turn on an overhead light and it works.
Assuming you got this far, take a volt meter on DC volts range and measure across the battery terminals. If you see a voltage of over 13 volts then batteries are being charged. If you don't see this voltage then something is open between the power distribution box where the fuses are and the batteries. There often is a resettable circuit breaker built into a terminal block up by the batteries mounted on the frame under the front cap - it will have a small button you push in to reset if it tripped.
It shortens the life of lead acid batteries to let them totally discharge, so don't intentionally do it (not saying you did). If they have only been totally discharged once or twice they the batteries are still usable but have lost part of their capacity vs. when they were new.
Finally, converter fan running. Fan will run to keep the internals cool. When batteries are in bulk charge and topping charge state, fans may never cycle off. If the converter charger senses batteries are charged and goes into float charge mode, then fans will still cycle on and off (a lot more off time than on time), even when you have every 12 volt load off.
One last thing about travel trailer DC power - always make sure that your breakaway switch is in the normal condition. If it somehow got into the breakaway position then you have DC power flowing to your trailer brakes , a large DC load.
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Randy - Manhattan, Kansas
2015 Vista 27N
2020 Ford Escape Hybrid
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