Upon doing the Poor Man Lift, I noticed that my alignments was never right, even after taking it to the dealers. So I took it to Firestone (Monday) and they to explained there was a problem, Caster was impossible to set to factory spec and camber was an issue too. Well I got the opporunity to go into the bay with the tech and we worked on my alignment. I already was understanding that Caster numbers could be all over the place and it is important for tire wear that Camber be 0 so we set my truck to have camber of 0 on both sides, and caster to be higher on the passenger side like +.2 - +.5 degrees over the drivers side, the actual number of degrees itself will vary. The higher caster on the passenger side corrects the right side "drift/pull" that Xterras always have. And the zero cambers can help for even tire wear. Toe should be set to factory specs without a problem. So far my results are great. The truck drives straight as an arrow no pull/drift at all. Just thought I would share.