It's optional for the tesla unit. There is a separate system that hooks up to multiple camera's you have to mount so you get a 360 top view around your car.
Some newer cars already have this built it. It's exactly as this example image phoenix sent me.
I'm not sure how this will work on the RAM cause the side cams are normally on the bottom side of the mirrors. For regular cars that's no problem, but the ram is 1/4 in front of the mirrors and 3/4 behind the mirrors. I don't think the side camera's are going to cover all the way to the back. That's what i'm trying to work out.
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