Windshield noise

[Extractor]

Could someone please explain to me how I am supposed to phrase my complaint to my service dept about the creaking windshield? noise at 80 mph. My 03 had it a little, I figured it was a bug that GM was working on. My 05 had it severely, to the point that you had to check if all the windows were up if you hit 70. When I had it in for service 3X I was told this every time...1) We aren't allowed to test drive that fast. When I replied that I would drive, send a tech with me, I was told their techs don't have the time to chase wind noises in a Hummer! OK so the very noisy 05 goes down the pike and welcoming an 06 which was nicely quiet until 1000 mi and guess what's back. Anyone have any tips to tell the service so I can enjoy this truck? My S2000 is quieter with the roof down and the tach at 8000. Thank in advance, and please don't tell me to slow down, I'll think my wife is on here!