Here's the update on my "steering lock-up" problem:
The truck was at the dealer for one week, and they did 2 road tests, checked for codes in the powertrain, body,and chassis. Checked for obstructions in the steering shaft from the column to gear and found no problems. Checked the steering linkage, and road tested it w/tilt at different positions, and everything checked out OK. Every questions I asked, about the on-board computer and event data recovery system were totally dismissed. The ultimate insult was when I went back to the sales manager and tried to work out a deal for another one, they offered me low blue book for mine and only the advertised GM specials for a new one. I was treated like someone who just walked in off the street.
I'm selling it today!!