Another day in the garage.
Shortened the 7 pin by about 15"
Spliced in the 2 to 3 module, all hooked up at this end.
One side of all the plugs soldered up. I wanted to keep the trailer and camper elec. systems complete separately for who knows why but I'm building in that option.
As far as camper elec system grounding, as I said I'm keeping that separate from the trailer/TV, well that's the way I've been leaning the whole time but not 100% on that. That is what I'm starting to dial in on as the wall/ceiling framing come into play with elec. and light fixtures.
Left rear corner (mechanical closet) is tails 4 pin plug and tail light ground, my little plug kit didn't come with 5 pins, 10g 12v from the TV on it's own 10g plug.
Other then just finding a few cable clamps, the trailer wiring is wrapped up.