My 69 FJ will not track when I try to tow it. Driving straight is fine, however when I turn and the front tires of the tow vehicle (the FJ) travel over an uneven surface like a curb cut the tires make a sharp turn in the opposite direction that I am turning. In other words when I am trying to make a left halfway through the turn the tires shoot to the right and bring me to a skidding stop! I have new leaf springs, new 4" shackles, new shocks, new tie rod ends, alignment was rechecked yesterday the toe is slightly in. All experiences and advise is welcomed. Help!