Part of the reason for this trip is to see family for Thanksgiving - the other part is to pick up the old truck - my grandfather purchased it when it was 3 months old with 300 miles - I "claimed" it as mine years ago. Many great memories attached to that truck. At the beginning of this summer he called and says "take-er home at the end of summer" so that's exactly what I'm doing. My job is busiest during spring, summer would be hotter than I'd like to do such a trip in a truck with no AC (one of the first upgrades I'll do) and summer heat can wreak havoc on an old vehicle.

I'll probably leave Boise a bit earlier than originally planned (Saturday late afternoon vs Sun morning) and stop just outside of SLC (~6 hours).
Since it sounds like I might be able to post google links:
OP Route 1: http://goo.gl/maps/e7R2W (I think this is the same as Midwest Michael recommends?)
OP Route 2: http://goo.gl/maps/GCxxY
OP Route 3: http://goo.gl/maps/tyMnW
OP Route 4: http://goo.gl/maps/O5r3K

My understanding of AZ Bucks suggested 4 day route:
AZ Buck 4 day: http://goo.gl/maps/u5ryl
AZ Buck 3 day: http://goo.gl/maps/bLUKc