Do I Need A Camera Adapter On A 2015 GMC 2500

I will be picking up a Z 2900 next week and I have a 2015 GMC 2500 for the tow vehicle.
I been reading that I need some kind of adapter for the electrical plug on the truck. Some say that I do need it and some say that I don’t. If I do, I would like to get one from Amazon before going to pick up the rv.
What adapter would I need?

I may have found the answer on this forum already.