George,
It's "Miller Time"….. (you've earned it)
PS: I wasn't expecting anything for Christmas, but since you put it the way you did, I'll stop checking the mailbox every day.....
PSS: Glad it worked out for you and that you now have a system that receives video and actually works....
PSSS: When I did mine, I used zip-ties to secure the cable to the gas line along the trailer frame, ran it up (into the trailer) inside a floor to ceiling cabinet, then drilled a 3/4" hole to pass the camera connector into the trailer from under the center clearance light. That's also in a cabinet, so no cables are visible inside the trailer....
I ran the "truck end of the trailer cable" up through the cutout for the landing gear, coiled all the extra cable above the center cargo door and used a "fish steel" to pull the end into the pinbox "above the fiberglass skin" and installed the connector there. The coiled cable is wrapped around the 7 pin cable and both are run to the "in-bed connectors" on the inside of the PU box....
Anyway, sorry about the rocks under your trailer, hopefully your skin will heal and you won't need to get under it again, at least for camera wiring.....
PSSSS: With a name like "wiredgeorge" you can't possibly be satisfied with a wireless video system anyway..... <just sayin'>
Merry Christmas !!!!!