I also have a backup camera. I tried adding tape, but 2 issues soon became apparent.
1) The camera is fish eye so the center line was very small.
2) The single vertical tape line didn't help get the angle right. I didn't add anything to the cab over.
I just realized that I have a Black & Decker laser alignment tool. It throws a bright red vertical line and has a magnet mount. I am going to try placing it on the forward bed rail so it throws a line down the center of the bed. If I put 3 tape lines on the camper, that should do exactly what that video did. That assumes the magnet is strong enough and red laser is bright enough during the day.
