Once a tire begins to wear unevenly or cup, it is extremely difficult or downright impossible to "save" it from continuing that way even if you fix the cause and rotate it.
It will take with it, to whatever position you mount it in, some unfavorable characteristics.
I got upset with our shop mechanics a few weeks back when they serviced my Volvo tractor and swapped the front tires and wheels side-to-side to promote even wear. I repeatedly, meaning hundreds and hundreds of times, have to turn very tightly on a side-slope lot to deliver to my customer. That causes all of my tires to eventually wear kind of weird on the outside edge due to the extremely heavy loads. My truck had never pulled or shook through the steering wheel or anything. Not the slightest bit. Now it does.
They just shrug and say its "company policy" to get every last mile out of the tires (even if it means shaking the rest of the truck to pieces apparently; not to mention the driver... ).
When I could not take one more heart-stopping "death wobble" (and it was way beyond "wobble"!) on my Dodge's Cooper tires, I replaced the track bar and shocks and had the entire front suspension checked for other problems and then aligned by TWO different frame and axle shops before I put a single mile on my new BFG Mud Terrains ($200 a pop).
I now have near-perfect and minimal rear tire wear with lots of tread depth and just as much tread in the front. But the fronts are worn SO badly they truly feel square and can be heard slapping and howling a 1/2 mile away! They look like someone took a very sharp knife and began randomly cutting some lugs off while leaving others.
There will be no saving them even if I ever get the entire front suspension rebuilt and aligned again and spend the additional money for all the "fixes" you must do to these lousy (and that is putting it nicely!) Dodge Dana 60's coil spring suspension. The "death wobble" will soon be here again... It really makes it miserable to drive the truck.
In a very fair and honest comparison, the same BFG MT's (except they are 35" instead of 33" like the Dodge) on my '87 K30 Chevy Dana 60 (and corp 14 bolt rear) have lasted for many, many years and are still wearing perfectly. The truck steers and rides like a dream on 4 sets of Skyjacker Soft-ride leaf springs with rear Firestone air suspension to handle heavy loads and Rancho RS9000 shocks. No comparison in ride or handling at all and WAY cheaper and more durable than anything that can be done to the Dodge. Inescapable conclusion: DC engineers suck! (edit: so do contemporary GM engineers for forsaking the rugged, tried-and-true Dana 60 and leaf spring suspension on my beloved Chevy's and going to wimpy independent front suspension. Just imagine what an awesome truck the old K30 would be with a 12 valve Cummins and NV5600 or even an Allison automatic... )
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