I had the same issue with larger tires. I can't say if it happened with the stock Michellins as I only had them on the truck for about 20 miles. Silverbullet's video is a perfect demonstration as it shows the wobble starting and then quickly coming under control. Almost faster than the naked eye can detect. The slow motion tells all. I figure if you can stop the wobble from happening in the first place with a good shock/stabilizer combo, why not? Even if it happens and is controlled quickly, the suspension will eventually pay a price.

Skip to 6:10 in this video for another view of wobble before and after:

Installing Rancho Steering Stabilizer & RS9000XL Shocks Ford Super Duty - YouTube