Tire side wall cracks?

I have Michelin LTX II tires on my Dodge 3/4 ton. I have had Michelin XDN2 drive tires and XZA1 steer tires on all of my tractor trailers. Although the outer casings do show slight cracking at the bead line, (Its a Michelin thing), I know it is only the very outer rubber that is cracking and absolutely not structural. The mileage and ride I get out of Michelin tires, no matter what the size or tread design is great. I prefer Michelins to any other brand. I tried Goodyears once in both the big trucks, and my wifes Expedition. (Wranglers on the Exped.) The ride was horrible on both. They hit every crack in the road and jarred the h*** out of you.