This is not good. Can be several things. First, check for a bent rim or bad tire belt by jacking up one tire at a time and inspecting how the treads track. This means putting a screwdriver at a fixed position near the tread or wheel rim seat and spinning the tire by hand. The spinning tire should not rub on the screwdriver any differently as the tire turns.
Should you detect wobble, hang the spare on the hub and see if the spare acts the same way, repeating the screwdriver test. You are doing this to test the hub bearings now.
Brake rotors can grab if they are warped. Sometimes rust will build up after a rain and cause the brakes to grab without you applying them. Spinning the wheels after they are jacked-up will help assess lumpy rotors.
Tie-rod ends can create wandering and steering shake. Check the tie rod ends for both inner and outer ends.
SOURCE: Death wobbles
Check that the tire pressure matches what is spec'd on the driver's side door panel. Yes, the fix is that simple and often gets over looked. When ford changed to the coil spring suspension in 2005 this problem started occurring. With low tire pressure, driving 60-70 mph and the truck travels over a large bump in the road, the natural frequency of some suspension component is excited. The truck dampers can not supress the oscillation and the truck begins to wildly wobble until the truck is slowed down to around 35 mph. Check the tire pressure monthly.
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