Bill: On my 98, after I bought it in Salt Lake City, the clutch was fine all the way to Caspar, WY, then to Denver and on the way back to SLC I picked up a vibration about the same as you mentioned.
What happened was is that there are 4 hevy duty springs on the clutch plate and two of them had broke causing the vibration while in 8-10th gear and also making it creep while in gear at stop signs, etc.
Took the truck to a transmission shop in SLC where they diagnosed it and had a new clutch installed in 3 hours. Parts and labor were about $1600.
The clutch life depends a great deal on the driver. Some may last forever or as little as 100K. If the operator kept his foot on the clutch pedal the 100K applies.
Will you be thinking about Wichita next year?
Bring your truck for show and tell please.
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