Vibration diagnostics

Had steer tires develop bad cupping wear like that on a 2 year old freightliner straight truck. Turned out to be the front springs would sag and kinda roll back when loaded and cause steer axle to rotate back and move out of plane a degree or two to one side. 6 rack alignments and 3 sets of michelins got wasted before a great alignment guy who does them mobile out of a service trailer said he’d check it fully loaded and bingo.
Pulled springs and took to a spring shop. They added a helper leaf and installed new shim and u-bolts and had alignment done loaded. Problem solved.

 

They don't call it a freight shaker for nothing! I'm so over Freightliner after having 3 over the years and dealing with all of their shenanigans, poor customer service, quality or lack thereof

 

Is it kinda like this going down the road?

 

Have you ever had the hub's, bearings, races checked on the steering axle? Also kinda sounds like tie rod ends?

 

So what turned out to be the solution?