The tires of a vehicle act like an amplifier. Any noise, roughness, or slop in the bearings or suspension components cause slight vibrations that are magnified by the tire, causing Death Wobble. I’ve corrected Death Wobble on Jeeps, motorcycles, and model helicopters.
Finding the source of a Death Wobble isn’t that hard. Find the bad/sloppy parts and replace them. This is much cheaper than guessing !!!! This tie rod end mounted to the pitman arm had some movement in it when the steering wheel was rocked 90 degrees in both directions.The steering damper was ruined. The new part for it is on it’s way!!