Lots of good reading Vic. Wiring/charging/batteries is going to be a pretty important part of leaving the grid. Unless someone talks me out of it, I think for now I need to make an operational plug, get the camper, and bring it home. Then I will dig in and see exactly what I have and how I can improve it. The current owner is using the factory wiring, so a 4 wire cord with the 7 pin plug on it.
So I think for now I will wire my standard 7 pin round plug with the 10 gauge power wires and 14 gauge marker/brake wires so I have something for the trip home. I am heading into this blind, and I think it will be much easier setting this all up properly when I have the camper here.
that's a workable solution.