Check your front lower sway bar. If good, it may be your wheel bearings, maybe they need to be replaced or repacked. had a similar problem with mine. Replaced axle, and got bearings replaced. If you don't get the bearings checkd your tire can lock up and send you rolling. NOT GOOD!!

1. Alignment
2. Tires balanced
3. Replace Axle
4. Check sway bar
5. Check wheel bearings
6. Check tire for weird or irregular wearing.

If you still haven't resolved this issue after all that you have done, just go to a mechanic.