Hi my grandpa owns a 2009 Chevy avalanche. I would like to install a reverse camera in the replacement tailgate spoiler hole. The truck did not have a slot for camera but I used truck to haul trailer and long story shot broke the rear spoiler, so I ordered a new one with camera hole. So I would like to install a reverse camera a stock one if there is wiring set up already in the truck.... how do I know if it can be set up for reverse camera