Food for thought (unless I am misinformed) ...
Your slide outs, levelers, and other 12v circuits run on 12v. I.E. your batteries regardless of being connected to shore power. In those circuits, your batteries “absorb” the high load without having to have 00 gauge wiring throughout the RV.
Isolating the batteries, as you seem to be suggesting, other than for storage, to me, would be detrimental.
(At least as I understand)
JMHO
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