I basically have the same issue since 3000 miles, and now I have 20,000 miles. I can tell you it is not the tires, not wheel balance, not alignment related. The wobble is random, at same speed, sometimes it is smooth and sometimes it wobbles like the wheel is going to fall off the truck.
I...
Anyone here got their wobble fixed? I have been bugging service and they finally fixed it, sort of. They installed a heavier steering wheel, the wobble is 90% gone, 5% still shake but goes away if my hand is on the steering wheel, 5% my hand will shake with it too.