Wow! You have a huge undertaking in upgrading the DC plant and wiring which will likely also require upgrading your main AC distribution. Both of which I just did on my coach, but not to the extend of adding solar and lithium batteries.

I have followed the Technomadia posts in the past and they are pretty good. I personally like Victron products, but they are certainly not wide spread except in much larger yachts. No surprise there given many larger yachts come out of Europe and specifically the Netherlands. I would have went with the Multi 5000 but it was just too expensive to justify the added cost without added value in my installation. I went with the newer Magnum 4K Hybrid inverter/chargers. Like the Victron and the Trace 4K units I had before, it will plus up the incoming voltage for temporary sags in the incoming voltage. You could achieve the same voltage plus up results with a Hughes auto transformer in front of more available inverters. The menu options for the Victron units can be overwhelming for some.

When you go down the path of upgrading your power system make sure that who ever is doing it understands what they are doing. It's not always about a large number of loyal followers. I followed a solar boondocking group for awhile where there was so much misinformation it wasn't worth following. You may want to consider Volta Systems if you are going to do a full electrical system replacement. Shy of a full system upgrade, Volta Systems will likely be cost prohibitive.