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wiring is absolutely not in the headliner. The third row video is only available in the XL models and adding actual factory parts is extremely expensive...I've priced it. I have however done this many times and have successfully interfaced into the factory system. You can play the same movie all the way through the truck or play a separate movie on the third row and listen independently through the wireless headphones.
I'm new here and working on adding a monitor to a 2009 Tahoe. Looks like $150 for a 7". How big are yours? and do they interfere with your rear view mirror?
Smallest would be a 9" and if you have a sunroof, then yes you will loose some rear view mirror visibility with the screen down. If you do not have a sunroof...you wouldn't really notice it.
Curious...what are you getting for $150.00...screen only? Does it match the headliner?