JDsdogs,
Shortly after I bought my '22 Sierra SLE 2500HD, I searched out a camera (system) for the rear of our trailer. I did locate one that I was going to purchase, but due to circumstance, did not. At the moment, I can't recall full details, but wrote down a bunch of stuff, so I will see if I can find the details. As I researched a lot of products at that time, I can't honestly recall if it is the OEM auxiliary camera or an aftermarket item.
Not sure of your trim level, but if you have at least the SLE, this item should work on your vehicle.
It does require, however, that you place the camera, run the cable (60 feet if I recall), to the cab, including prying up some trim and routing to an inlet just below the head unit (on my previous truck, I replaced the head unit with an aftermarket unit and had to route and pry trim and dash, so I am conversant in this - actually did it a couple times). The image plays on the OEM screen.
Marv