[HUMTECH]

How wide are the tires, A wider tire can have this effect on A highway which has ruts, the tire being wider than the rut is trying to track in the rut, but will move in and out as the tire does not fit the rut. If it does the same thing on A good(new) flat surface road you definatley have A front end issue, possibly the steering gear may have worn pitman shaft bearing or other issues. Usually when felt in steering wheel can be attributed to A separated tire or bent wheelor a balance issue which will be magnified by A higher than stock offset on the wheel.