Front wheel alignment time

[epowers777]

I need to get my truck aligned. I just got it 99 ford f350 4x4 dually. It pulles to the left. the dealer took the front tires off put them in the inner rear dually. The out side tred is worn and inside is still thick. So is there anything I need to look for before i take it in. The power steering pump has a small leak in it Im sure that has nothing to do with it. Nothing feels loose while driving either.
Also do you recommend taking it to the ford dealer or a tire shop?
It has 230,000 Miles on it.