There still would be a hole in the rear garnish for aftermarket camera and the current wire they will draw from somewhere to power that camera.
They will definitely cut the reverse light wire in the trunk to program the cam for switching On upon reverse gear. Not to mention all the door sills on any one side and rear seat needs removal for taking the feed from unit to camera as well. It isn't as simple as they will make it sound to sell their aftermarket system.
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