Ronniejoe,
I have the exact same problem with my tires on my '96 Sub. I am on my 4th set of tires, and they all get progressively worse as more miles are on them. So far the worst were a set of Dunlops. After about 30K miles, it seemed like I was taking them in for re-balancing each month.
Since I do all my tire business with Discount Tire, I am suspecting either their balancing machine, or their Tech's.
I do have to rims that have a slight bend in them, but Discount says they can balance that out - not bent enough to replace.
If you find a solution, let us know.
Bill
1996 K2500 Suburban - Purchased in Sept. 2002 - 297K miles
Only mods - K&N filter, Greg's Oil Cooler Lines, Home-made FSD heatsink, Kennedy quick heat glow plugs, LED interior lights, Kenwood stereo, 2001 GMC aluminum rims. AutoMeter Guages (boost, EGT, TransTemp)
2007 GMC Acadia SLE - wifes car.
1987 Buick GN totally stock - 48K miles