I’ve attached a few photos from my backup cam install, hope their helpful. It did require removing pillar trim, door sills, quarter panel trim, all of which is fairly straightforward but feel free to ask questions if you have them.
To route the camera harness through the tailgate, I pulled the OE rubber grommet/sleeve and ran the camera harness inside that sleeve to protect it. There is another rubber grommet for the license plate lights that I ran the harness though so I didn’t drill any holes in sheet metal. I’m happy with the fit/finish. I know this reply is light on detail, but haven’t had my coffee yet. If you have questions just ask, I’ll get back to ya.