Carrier/rack problems of the 2012 Ford F-350

Death wobble. This has been going on for several years and is becoming increasingly dangerous. We have replaced tires, shocks, steering dampener and track bar. If we hit a bump in the road at highway speeds while in a curve the death wobble is so severe it is lucky that I have not lost control. But the only way to stop it is to stop the truck - on the highway in traffic. I have nearly been killed with people barely able to avoid hitting me. It seems to be a known issue that is, as yet, unacknowledged. Commonly attributed to the 'faulty parts' that do not fix the issue for more than a very short time. Take it to the dealer and they pretend to have never heard of it before as thousands of others have stated in complaints across the internet. It has become even more severe and will happen even when driving at highway speed without the steering in a curve. The issue first began at about 90,000 miles. Typically at 60-65 miles per hour. Today it was at 60 mph, 30-40 mph repeatedly.