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.
I had the same problem. When the tire tread gets worn down the balance of the tires changes . I replaced them and the problem went away
Check out this site I know they had excellent success with fixing the wobble on the 05+ SD truck superdutywobble.com
Check to make sure the tires are not p rated they should be LT. I have a 96 ram 2500 that did the same thing and that was my problem thanks to wal mart
Check the ball joints for looseness this will cause an excessive shake at higher speeds
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