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It's important to get the PDR option with the car if you want it. The camera is incorporated into the rear view mirror, there is different software to run the icons and the displays, plus there is a SD card slot in the glovebox. It's not something you can retrofit.
At Bloomington Gold I talked to a fried that is an Engineer for GM and was working the Chevy tent. There might be a solution for us without the PDR down the road.