Sometimes you have to put "steer" tires on the front to solve the tracking problem. I bought a 2004 24 foot C on a 450 chassis. It was pulling to the right when I test drove it so I asked for an alignment, which I was told was done. When I picked it up it now pulled to the left. Rats! I had a great alignment specialist for my Class A so took it there. Still pulled to the left. Bought new shocks and tried another alignment shop. They concluded the shocks didn't need changing, and that my problem was that the aggressive tread on the front tires was squiggling and suggested I try steer tires. Had two installed and it drove straight as an arrow thereafter. Just becomes a bit of an issue if you have to rotate them to the rear for some reason.