Tow in should be 1/4 inch. measure with a 4 foot sheet rock square and a square clamped on the end. Measure with the wheel on. I presume that you mean the wheel rubs in reverse and the steering turned all the way in either direction. Shocks may cause this problem but worn bushings on the a=frame is more likely. Also check the tab on the spindle to masure it has not been bent.