Just wanted to post an update to this thread:
I replaced the air bags and it seems to be fixed, after seeing the bubbles from the last test I felt pretty good about replacing them... While I was at it i also painted the frame and rear axle... looks better than new and no more sag.
Before:
After:
Thank you all for your help... I hope something in this post helps another Hummer buddy... I also hope I can return the favor sometime.
Humtech and Ed... you guys are too cool... Thanks.
