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Brad,
I can only comment on the second part of your question.  Have been researching a replacement for the Ample Start (no longer available) when it fails and to future-proof the coach's battery types.  I came across and zeroed in on the new Sterling 12/12 battery charger, https://www.sterling-power-usa.com/ that would work for the Ample start replacement.  One of the things I really liked, the Sterling charges Bi-directional. You may want to look at the specs to see if the Sterling would work in your situation.  Disclosure, I have not purchased one as of yet as the ample start is still working on our coach.

Good to know, I'll check those out.  Now solve my first problem will yah.