moving batteries and installing Victron inverter-charger under front bed
I just purchased a used 2016 23FB international and going to add 4 battleborn batteries under front bed along with a 3k victron inverter-charger. I understand how to wire based on lots of research and youtube videos, but can't seem to figure out how to get the shorepower wiring from the old converter location to the new inverter-charger under bed, and the other wiring that needs to run back to the AC-DC panel in kitchen from new inverter-charger.
I'm guessing I will need to go under the coach to run wires since i'm not taking floor out.
Has anyone done this and if, so any pics, suggestions ...