The alignment shop said the trucks camber was in spec (barely) but that the spec is so wide it could still cause problems. Everything in the front end was tight according to them. They removed a offset cylinder thing on the right front knuckle and replaced it to change and make the camber more negative to compenstae for the tire wear. This adjustment required replacement of the offset sleeve (cylinder) which changes both the caster and the camber so it takes longer to get all the specs set. After 4 months it appears to have corrected my problem. I requested they keep the caster between +3. 5 - +4. 5 deg, as recommend on this site, to correct for "death wobble".
Here are the alignment spec's the shop took before and after the camber change:
Before:
Camber: Left= +0. 0 deg Right=+0. 2 deg
Caster: Left= +3. 5 Right=+4. 2
Toe: Left=+1/16" Right=+2/16"
After:
Camber: Left=+0. 0 deg Right= -0. 5 deg
Caster: Left= +3. 5 Right=+4. 1
Toe: Left=+0/16" Right=+0/16"
The alignment shop said since doing the adjustment at the right front knuckle affects both both camber and caster it took 1 1/2 - 2 hours to do. That was 3 months ago and the tires still show no signs of the outside edge wear I had before.