Well, I had the truck realigned again. It was within factory spec, but the drive axles were thrusting against each other. I know some techs do that on purpose, but my local shop thinks that could have been causing the from end to shimmy back and forth. I'm not so sure that was the problem, but time will tell, I guess. I still have the steering wheel shake. I put 6k miles on the new alignment so far. The tires are certainly wearing differently, but I don't know if they are wearing properly. The ridge formed at the edge of the old uneven wear has smoothed out some. I'll probably run the tires a little longer before I pull them off and set them aside for future drive tire use.
I'm pretty sure I've decided to keep the truck for a few more years, especially since it's paid off, so I'm probably going to have all new steering components (at least kingpins, tie rod ends and bearings) put in sometime in the near future. Had I not just spent $4k on a tow bill and new clutch, I'd probably be doing the from end a little sooner.
As a side note, while I was sitting in the KW dealer in Knoxville (who treated me VERY well and did a great job, by the way) getting my new clutch installed, I spent the day in the drivers' lounge talking to a Canadian leased o/o who went out and spec'd a $189k truck that had been down 33 days for repairs out of the first three months he'd owned it. That made me very glad to be repairing my 916k mile, paid for truck (with lifetime 6 cpm maintenance cost for truck, trailer, APU and tires).