diffrnt, you have a Yukon XL so your rear doors are different then ours...yours go straight down with no curve for the rear wheel well..however, on a standard size yukon, they have to notch the rear door for the wheel well..so the glass can not roll all the way down
ok...so actually, I was originally going to throw some ideas out there to see what everyone else thought BECAUSE this IS a mod everyone would like to do...I through a pic up and wanted to see what you guys would come up with...seriously, how many bogus pics do you really see me posting...gimme a break...not like Im constantly lie'n bout shit...anyways, this thread DOES have legitimate reasoning behind it..and I AM serious about my idea of how to go about this!
I believe if you cut like, a 1 inch wide line out the bottom of your door, and another matching it into the wheel well, then enclose that with a pocket...it could work
You could install that dustbrush stuff to keep foriegn objects out...and just like when the rear doors are locked, you can pull the inside/outside handle and it wont open at all, you could put sensors that will leave the door locked till the window goes back up to a safe height