Sway Bar problems of the 2015 Ford F-350

2015 f350 4x4 6. 7 we tow a 12k trailer gooseneck. This problem occures loaded and unloaded. Any bump over 50 mph on the driver tire will cause a violent shake that will persist though acceleration steering inputs and braking, soft or hard. Only slowing to below 45 sometimes 35 will stop the shaking. During the shake steering is nearly impossible, and attpeting to keep straight resulted in twisting the steering wheel out of alignment. Thus far we have replaced steering stabalizer. Track bar, and assosiated bushing and ball joint, tires, multiple alignments, sway bar links, balljoints, shocks. Each repair makes the problem seemingly better for a time but within a week it returns. We are a danger on the road and have sense stopped driving until a hard resolution is found.