I would contact a local car audio installer and ask them about adding a camera to the factory A/V head unit. There is a YouTube video from an installer that added an aftermarket camera to a 2014 1500 Ram with the factory head unit so it maybe possible. If you can get access to the back of the head unit, look for A/V (RCA) inputs....if they are there, that would be an easy DIY install. I'd also recommend a wired unit. Lots of threads here with complaints on interference from wireless units where the camera is just too far away to get a good signal.
GOAL is a good idea but if you get into CG where there are kids running around, a back up camera is a good safety feature.