Badger, How much pressure are you running in your tires? I had trouble w/2-ply sidewall (E-Rated) tires and running 65# or less. I have an ‘11 F250. The sticker on the door says 65PSI. I need to run 70#+ to keep the shimmy-shake down. We tried a new steering stabilizer @ 30K Mi, didn’t help, finally service guy asked me to run the tires up to 75#, smooth as glass.
2-Plu sidewalls were giving me too much “Sidewall-Flex” @ lower pressure.
Take it for what it’s worth.
