I obviously can't feel the pull, so it's up to you what you think is excessive. You can't expect the car to drive straight without driver input for miles. If you are concerned with it, have the changes made and you should be able to feel the difference. I believe your truck is fully adjustable with eccentric cams in the lower control arm. If this is the case, the alignment shop should be able to get it set dead on, assuming there is no excessive wear in bushings, bearings, ect...and no damaged parts.
Cross camber is simply the difference between the two sides. The (-) sign indicates more positive camber on the right. The truck will pull to the side with the greater positive camber and/or the side with the least amount of caster.