The knocking noise can be a hard one. On the early H2s (mine did it) the driver's side inner and outer fender was popping. To solve the problem they would take a round-nose punch and knock dents/dimples inside the inner fender. It obviously took up some slack on the fender and kept it from flexing.
On my truck I actually thought it was a front suspension issue and it felt like someone was hitting the bottom of the floorboard with a hammer. It was the fender flexing. Dimpled it and it hasn't done it since.
Keep taking it in and/or try another dealer. It's not "little" stuff. I can assure GM wants it fixed as much as you do because they don't want to have future potential customers (you and your passengers) thinking it's a rattle trap. Problem is that some service technicians don't share this same outlook and you have to hand them the problem for them to fix it.
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