Excellent list and recommendations, Carl
"King pins" is an understatement (to the un-initiated): king pins, bushings, axle-hole, and wallowed-out journals in knuckles/spindles (deadly and almost non-repairable).
A worn king pin assembly is a big deal - if you do not tend to it, you might destroy the axle (no more over-bore) or destroy the spindles (wallowed-out beyond being useful).
Another factor that is underestimated is PSI in the tires.
Adjust PSI for optimum tracking vs steer-ability (ease of steering).
