Wonder what the incremental adjuster assemblies are in that tsb? Caster adjusters? I’m unfamiliar how caster is adjusted on ford axles, but front end alignment at 30k Miles seems a little suspect. Unless the front wheels whacked something really hard or some other unlikely conditions that truck shouldn’t need a front end alignment for a long time.
I’d be interested why it was aligned and that may be a clue as to why it got death wobble.
Good luck with it and if I could suggest, if the dealer under warranty can’t figure it out and you’re not handling it yourself, find a good truck/ 4x4 shop with reccomendations.
Most tire and alignment shops aren’t going to be the place to fix it.
Definitely do more research on it before spending any big bucks.