If you don't have them the factory service manual and the driver's handbook (owner's manual) have a great deal of information in them on service and maintenance.
Both are avaliable as reprints and you can download digital working copies of the chassis service and chassis overhaul manual here.
RTFM ... Read The Factory Manuals... download 'em here
If you are going to be paying a computer jockey to learn how to align your truck you might as well do it yourself with a homemade toe gauge.