Consider the superduty ''death wobble ". Brother's 2013 had it in spades. Google it. Scott
I cured mine with tires that had a stiffer sidewall or running more PSI than the door jamb suggest (65PSI). 70-75PSI fixed all the tires I've tried that wobbled @ 65PSI. FWIW, I'm on my 2nd super duty (both diesel) w/8 sets of tires between the 2 of them. I've run BF Goodrich (3x), Continental, Nitto (3x), and Goodyear.
