Carrier/rack problems of the 2017 Ford F-350

Experienced heavy osculation at 25k miles. At 26k miles the truck will go into a "death wobble" at speeds over 60 mph. Any time I hit a bump in the road at speeds about 60 mph the truck violently shakes and it's very difficult to maintain control of the vehicle. This is a huge safety concern. Took the truck in to get it repaired under the warranty. The dealership was very familiar with the death wobble. The track bar was on backorder; however, I found one available at another dealership. I drove there, picked it up and took it to there dealership who fixed the truck the first. Got the truck back several days later. At 31/32k miles, it started to do the osculation/vibration and steering wheel shake when I hit any bump on the road/rough patch at speeds over 60 mph. Took the truck back to the shop at 33k miles after it did the death wobble and I almost lost control of the truck. The dealership fixed it a second time. The same day I picked it up on the second attempt to fix it, I was driving home and it did the death wobble again. It was like a Mini-death wobble with a very heavy osculation, shaking and vibration when I hit a rough patch at 60 mph or greater. The truck is now back in the shop and waiting for the third repair. The death wobble occurs at speeds usually over 60 mph on the freeway or any country roads. It has happened a few times at about 55 mph. Driving in town it doesn't do it at lower speeds (40-45) unless you hit a very big bump/pot hole/rough patch.