Suburban 2500 Questions

Hi all. I have a 2008 Chevy Suburban 2500. It only has 61,000 miles on it. I was curious if anyone with a similar vehicle has had the drivetrain vibration issue? This one used to be REALLY bad. I put $1000 worth of new tires on it. No different. Asked to have them road force balanced. No different. I finally demanded that the mechanic take the drive shaft off and rebalance it and then reinstall it. This took out about 85% of the vibration.

My question is, is there anything else to be done? It still has a pretty bad vibration whenever there's a decent crosswind. I don't know why that would matter, but it seems to. Even under good conditions, I can still feel it vibrating, but it's more of a hum further back in body of the car than the all out dashboard rattling that was happening.

Would new shocks all the way around help? The ride is really pretty bad now and it seems even a minor pothole or crease in the road thunks pretty hard. I put most of this on being a 2500 heavy vehicle with 10 ply tires.

I've heard others reference Bilstein shocks? Yellow ones? Think that would help with the little remaining vibration left?

Sorry for the long post. Just curious about other's thoughts on both the driveshaft issue AND the shocks.

For what it's worth I did have this into a transmission/driveshaft shop to have them look through the entire drive train to include driveshaft, U-Joints, etc. They said all looked fine. (even before I had the driveshaft rebalanced).

Any and all ideas or opinions welcomed!

Thanks.