RV Cameras

I am in the same situation with a 2015 GMC 3500. I just communicated yesterday with Ed at "cubbycam" who is in San Jose CA and specializes in GMC cameras. I already sent him pictures of the backup camera connector and it is new for 2015. He is working on trying to find a source for the six pin connector. I don't know if you have tried removing your tailgate yet but GMC did not make the wiring part easy! The wire from the tailgate camera goes through two wire holders under the tailgate that you need to open and release and then terminates in a junction block on the frame to the left of the spare tire. Very challenging to figure out how to release the connector the first time! There is also a "dummy" connector next to the real one that your are supposed to remove and put in place of the real one to keep the socket clean when the tailgate is off. Let me know if you need help with wire disconnecting. You can google cubbycam and see their offerings. Hopefully they will find the connector and then they said they can make me a wire/socket/camera of any length I need that I can mount on my camper.