Peter Goddu,
I think you're on the right track by starting with that re-settable circuit breaker you identified. If it doesn't reset automatically or have a button to reset it, it may need replacing. Although try bypassing it first to see if the 12V system then works in order to confirm that the breaker was the cause. If your batteries read 12.75V after having been unplugged for many hours, then they are fully charged. By "coach batteries" I assume you meant the trailer batteries? I think the term coach battery is used for the engine starting battery on a motorhome and "house battery" is the term for the deep cycle batteries used by the camper part.
I would also make sure you don't have a battery disconnect switch engaged.
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2012 Aspen Trail 2710BH | 470 watts of solar on the roof | 2x6V GC batteries | 1500 watt PSW inverter | Micro Air on A/C | so far strictly boondocking
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