Front Suspension Stabilizer Bar problems of the 2018 Ford F-250

A residual vibration after hitting a bump started in Feb 2019 at 8. 6k miles. Dealership replaced damper assembly. All good for a while then vibration with hitting a bump started again in oct 2019 at 25k miles. On 11/2/19 at 26k miles at 70 mph experienced severe/violent shaking in the steering wheel and had to slam on brakes to stop it and bring truck under control. The Ford dealership replaced the damper assembly again and the stabilizer bar. Still had the residual vibration after a bump, took back in to dealership on 12/4/19 and they could not �duplicate customer concern�. On 12/11/19 and 12/16/19 at highway speeds on I-87 between albany and glens falls, NY, I again experienced severe and violet vibration/shaking in the steering wheel. I had a difficult time keeping the truck in the lane I was traveling in and again had to immediately brake hard in heavy traffic to bring the truck back under control. Brought to a different dealership and now being told that despite 1/2 the tread life remaining on the tires that Ford is recommending replacing the tires and that an alignment is needed. This dealership is refusing to do alignment unless we replace all 4 tires. At this time the truck has 27k miles on it. I cannot understand how Ford can continue to deny this is a major safety issue with their trucks with all of evidence supporting otherwise.