So the day after Christmas was 'work on the truck day'. Steering wheel had a lot of play in it - about 2 inches of turn. I adjusted the play out and it drives a lot better. Here's how...

Spray the top of the steering box with a little brake cleaner to clean the dirt off.
Work on the truck from underneath. Key turned on one notch to unlock the steering wheel, but truck not running. Wheels on ground.
Use a 16 mm wrench and a 4.5 mm hex wrench (i think, if not 4.5, then 5.0)
Insert the hex wrench into the center of the adjusting screw and point it towards the front of the truck.
Hold the hex wrench and loosen the lock nut.
Have wife, g/f wiggle steering wheel, or else get up and down a lot.
Tighten hex wrench about 1/4 turn at a time to take up the play. I turned mine about 3/4 turn to take up 2 inches of play in the wheel.
Hold hex wrench and tighten lock nut.
You're done, take it for a test drive.