i used to work at a body shop in west knoxville for a year and my boss had a 07 f250 outlaw it had 23k miles then. 16 inch adjustable suspension lift and 37.5 tires. it had brand new tires and front end. one day it started wondering on the road and wanted to wobble pretty bad at a slower speed as u said. we dropped the lift to 6 inch and put 35 radials on it and never happened again it could be the last thing u would think it is