question about your ride on your rims

How are your rims centered? By lugs or do you need hub eccentric rings? Offcenter wheel on the hub will cause a Vib and it will act like a out of balance tire.
When you stop and the road is fugged is ok your rims are just getting pulled into the ruts in the road. Does it pull when you brake? Where do you feel the vib? In the steering wheel it's the front tires in your ass it's the rear.
Also like someone mentioned get your align check a spread in caster or camber will cause pulls
Camber pulls pos Caster pulls neg
Also a real wide spread in Caster will cause a shimmy in the steering wheel
Also check your steering stablizer if you have one. It is the shock on the drag link . If i'm not mistakened(?) these trucks have a pretty high caster settings and the stabilzer is there to get rid of som e of the vib
HTH

Not always, if its a sidewall belt it will still wobble like hell if its not hitting something.

whew im going to try to answer all these questions today. yes when i brake and i there are ruts in the road, it pulls like no other. almost feels like im driving FWD and im pulling off the line trying to hold on to make sure it doesnt slam into the wall.

i guess alignment will be the next thing i have to get looked at/done, b/c sometimes it aggravates the hell out of me.

i dont think i have/hear a thump thump thump while im riding, as far as the ride its usually smooth, just yesterday and other rare occasions does it shake like it did. so i think the belts in the tires are good, not to mention i have never curbed these tires and they have at least 50% tread left