A lot of people install a manual disconnect for their coach batteries to eliminate parasitic loads that will drain you battery, but there is a 100 amp breaker in the battery box of the Axis and Vegas (at least) that does the same thing if you trip it.
As far as the converter automatically going into maintenance mode (13.1v), the converter charger in the Axis is not the best quality and many have found that it does not work as it should. If you have one that does not work as it should, it could quickly “cook” and ruin your batteries if left plugged in. You can easily check it with a volt meter.
I second the search mode. Most if your questions have been “hashed over” repeatedly on this forum and there is a wealth of historical info here.
Also, download Ed’s manual for the Axis/Vegas, if you have not already.
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