RE: vent window leak?
Yes, I had this same problem or one like it. I took it to the dealership and they drilled a small hole in each latch and into the door frame and screwed in 1 or 2 inch screws into the frame totighten the windowsup some. It is a common problem from what I was told. It stopped on one side, but my drivers rear window kept leaking. So I tightened it myself and it helped, but did not cure it. So I was looking and it looked like the 2 front hinges were pushed out so I pushed from the outside in too were the hinges were and it pushed in and never leaked again. Now to keep it from happening again I never open those windows.
2004 GMC Sierra Extended Cab
-K&N Series 77 CAI
-TB Bypass & removed insulators
-Catback System with Stainless Steel Exhaust Tips done by Mr. D's Muffler shop off East Hardy & Gulfbank
-Factory 20s with Michelin LTXs
-Spray n liner with a Truxedo bed cover