Bruce-
I've come to the conclusion that it's not a serious issue, but I will still get the master mechanic at the Ford Truck dealer to look at it when he installs my Cat's Eyes.
Two things have persuaded me not to be concerned: 1) When I was underneath the chassis, I measured the difference from a number of areas on the underbody (including the leaf springs) to the ground and all of the measurements were within a 1/4" of the opposite side. 2) While parking in a Lowe's Home Center lot today (which was level), I measured my counter with a two foot level I happen to still have in the unit, and it had the exactly opposite lean that it had when it was parked in my driveway. Weird huh?
My wife has a conference in Portland Oregon in early June and we've decided to drive out via New Mexico and Arizona and return by way of Banf and Toronto about a month or five weeks I figure.