Update:
got the truck in to have the wheels rebalanced. As suspected 2 of them had thrown weights. One in front and one in rear. Now the vibration is WORSE. Especially under load like going up a grade. Next move will be pulling wheels and checking everything on the suspension for tightness and damage. Then I'll swap the spare on one wheel at a time and see if that has any effect. If not, my next try will be to dial the firmness on the coilovers back up to the mid-point of their range and see if that has any effect. This vibration is only really noticeable once at 60 mph and above. Waiting for the weather to cooperate.
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