Thanks for the responses, and sorry, guess I should have been more explicit in my first post.
The camera is not an aftermarket (obtained from a non GM location) product. It is sold by GM and is generically listed on their site as "Auxiliary Trailer Camera". It comes with the camera and cable, which runs to the rear of the truck and is plugged in to a connector which also is required (replaces the 4 pin). The camera view can then be seen in the Infotainment screen.
There are no RPO codes in the glovebox, the only thing there is a sticker related to camper requirements.
I did take a photo of the QR code on the door pillar, but when I queried it, it would only show 32 (I think that was the amount) codes and am not sure how many more are available.
I have the SLE with the SLE Convenience Package and Preferred Package, and as previously noted, do have the reverse camera. When I was ordering, I was (repeatedly) told the auxiliary camera would be compatible with my set-up. However, when I later checked the website for the camera, I found the codes I listed previously, many of which I could not find in my QR codes query.
If the camera is not compatible, and had been told that up front, I would have changed the options to ensure I could use that one. So just trying to clarify if I can use it or not with my set-up.
Marv