New dc-dc charger for RV not marine

Existing:

Tow Vehicle Fuse to trailer power = 30 amp

30 amp Travel Trailer

Converter is Lithium-Compatible.

  • WFCO WF-8735-AD-GE.
  • Converter output to LI is 14.6VDC/32.5A

Type 27 Lead-Acid Marine/Deep Cell

Proposed:

100Ah Lithium – Brand TBD

Victron MPPT 75-10 Controller (existing controller is 10amp but not lithium compatible)
I want to install a dc-dc charger to protect the TV from high recharge surge from the lithium. I also want to check if there is anything protecting the TV battery from giving power to the TT when the TV is not running.

Questions

  1. Where should the dc-dc charger be located?
    A. Does in go in the Tow Vehicle?
    B. Does it go in the Battery box to intercept the wires at the battery?
    C. Does it go at the converter?

  2. I am seeing “Isolated” and “Non-Isolated”. What is the difference?
    Thanks in advance. I need to either get this done in the next couple of weeks before the first trip or simply buy another lead-acid as the battery I had sprung a leak over the winter and I now have nothing. There is nothing about this (so far) that would make me defer installation to somebody else, but my pride will not stop me from hiring somebody is this gets too techy. I have better-then-average skills for home repair (electrical, plumbing, etc.) and I have already installed some add-ons to the Travel Trailer but try to stay conscious of my limitations.

Thanks to all in advance.