Hello, looking back 3 years your writeup on the camera updates, this was a great writeup and I have been upgrading my 2020 Silverado with the extra cameras. I added the front and the two trailering cameras, ordered the video module on eBay for about $150, all is working great so far. I am now doing the side mirror replacement. I got mirrors with cameras on eBay for about $200 each (not the wide tow mirror). I see that my door harness already has the video cable in it even though the original mirrors did not have cameras. You mentioned that you can't use that coax that is in place and I'm wondering if you can explain further? I'm guessing that if I trace that wire into the harness connector in the door jam, it might terminate there and on the inside truck. Or do you know if it actually routes all the way back to the Video module already? I was thinking it would be a little cleaner this way vs cutting open the wire loom and putting the new cable in. I just got my two cables in from Segemart today.