Hi, I have a 2021 GMC 3500 Denali and purchased the camera for my 5th wheel. I had the same issue with the video plug at the bumper and not in the bed with the light plug. I can’t believe that I ordered this truck with the pucks in the bed for 5th but the video plug was at the bumper and the dealer won’t do anything.
So I used the previous post to swap the two plugs and bought two video cables as described.
‘the whole process only took about 1-1/2 hours.
now have video plug in the bed for the 5th wheel trailer.
thanks for your post.
‘the toughest part was peeling the bed liner off where the video plug goes.
Ed