From reading the whole story it seems you had a draw on the engine batteries for a week that killed them. You need to find that.
And also a draw on the coach batteries that killed them. Normal if you had anything 12v on and your convertor isn't working or the coach is unplugged.
If it has been plugged in your convertor isn't charging your coach batteries properly or they wouldn't be dead.
With all the batteries being new it seems someone skipped fixing the real problems and bandaided it with new batteries.
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