Took a spare hour today to finish the backup camera install. Wire came forward easily through the headliner, down A-pillar and across below glovebox. Of course, the RCA input stuck out too far to fit the head unit back in correctly so I had to drill out some of the plastic bracket behind it. It's never easy!
The Amazon camera I have seems to work well however the instructions said to cut this white wire near the camera to remove the backup lines. I did this since I can't turn them off on the head unit I have but they're still there. I guess I'll learn to live with it, I don't want to go back into the tailgate to try and fix it.
I also grounded the parking brake wire to get video in motion while I was at it.
That said, I'm happy overall with the cameras' factory appearance and seemingly good quality. I am really glad everything worked when I turned it on for the first time!
Link to camera for reference.
Stealth install, looks like factory: