Thanks everyone! I physically mounted the panel today but cannot figure out the wiring... spent a few hours with a friend today. We wired a small battery to the roof plug to ensure it's hot and played around with a multimeter in the camper battery box trying to see where the wiring terminates in the battery compartment... there was a stray capped 12ga blue wire so I thought that would be it, but we couldn't get anything out of it (ground to the grounding block and positive to the blue, we got 0 V with the battery connected to the roof plug). There are a few 12ga whites but they are all connected to the grounding block.
I also looked in the storage cabinet above the dinette and couldn't locate the blue/white wires anywhere near there. There is a single junction box up there but it's for house/AC power, not DC, and I didn't see any other access ports/junction boxes.
I wonder if my plug isn't pre-wired at all? Though it seems odd for the factory to install it and not wire it? Where could these wires be hiding?
One possible next step seems to be to remove the roof plug and see if it's wired/tug on the wires to try to locate them.. but given it's winter and snowing daily for the next week, I'm not sure I want to remove the sealant up there and redo it (I guess I could go up there with a hair-dryer)...
Any other ideas/anything I'm missing?
If I abandon using the pre-wired plug, what do you guys did who ran your own wiring? Did you drill a hole in the roof and how did you route the wires inside to the battery compartment in a clean way? Obviously all the wiring is hidden inside the paneling...
Thanks again!!