A> Try visiting truck repair shops when doing chassis work - not an RV dealer. And using a tire dealer for chassis work also not recommended as they specialize in tires only. RV dealers tend to charge the most for labor, and are often not as well experienced or trained to work on truck chassis as regular truck dealers are. In your case the shop was not able to do an alignment, but that is pretty basic and necessary work. And the equipment required to do a toe-in wheel alignment is fairly simple these days, using laser alignment tools.
B> I again say that somehow the dealer that installed your new tires changed/damaged your suspension - as proven by the tire wear seen on your old tires. You say that your handling was fine with your old tires, and their normal wear supported that by not showing any abnormal wear.
But as soon as this tire shop installed new tires you now have horrible handling. What were the change factors? (1) New tires and (2) shop work on and around your suspension.
As mentioned before - highly unlikely that new Michelins would cause this, leaving . .. shop work.
You said that the tire dealer inspected the steering suspension (why front only?) and found nothing - which they would hardly admit to if they had. And did they do the tire spin testing I suggested to see if all tires running smoothly?
So find a truck shop which can check your alignment, and have them also inspect front and rear suspension for any irregularities. An experienced truck shop used to working on truck chassis should quickly help ID what the problem is. And I suspect that based on what they find that you will be going back to that tire shop asking for lots of $$ back to cover what they did wrong.
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