alignment problem

My 2002 1500 silverado has a 6in procomp lift.I had it aligned at les schwab and it pulls alittle to the right and the steering wheel is turned a little to the right.They knew it was pulling to the right a little when they gave it to me .Do they know what they are doing? Should i take it back? Is there some tricks to aligning this truck they dont know?

There are no factory specs for oversize tires (I'm assuming oversize with a 6" lift, I may be mistaken). All they can really do is guess, unless they saved the specs from a sucessful alignment on a similar truck.

To get the steering wheel to center, you can adjust the tie rods.