When I hear someone say that they had an alignment and it is spot on I want to cringe. Modern alignment machines are basically built so anyone can set an alignment to manufacturers specs. Basically they have a green and go set up. If the readings are within specs the reading turns green and it should be good to go. A lot of modern vehicles only provide for a toe adjustment. If your truck is "spot on" these readings and you have a pull related to your alignment then the person doing the alignment needs to adjust your camber and caster to compensate for the pull.