Yeah the alignment guys really don't like to do our trucks right because they have to install "camber shims"
You can install these yourself if you are inclined and have tools. then go back to the alignment shop and tell them to get it right this time because you made it easy for them.
If not, get these-( you need 2 kits-one for each side)
Ac delco part number
45K18011
http://www.google.com/products/cata...a=X&ei=k_8ZTobVFYf_sQLkpezBBw&ved=0CEQQ8wIwAA
Take it back to the alignment shop, have them install them and get it right. I would like to see the printout of the alignment specs they gave you--which they would have done had they got it right.