Front Tire alignment failure

I bought my truck used; the previous owner had new tires installed and a front end alignment. The truck needed constant correction to keep from steering right. I took it in to Les Schwab and had it aligned again to factory specs, same problem, no change. Took it back, the alignment specialist knew what he was doing and made some corrections on his own. Truck tracks straight as an arrow and has done so for seven years. Tire wear is normal. He told me what he did but I can't remember the details.

My guess there is an alignment specialist somewhere that can make your rig right.