Tearing off the roof is a very big job. Never heard of anyone tearing off the sidewall.I don't relish the idea of tearing the roof and sidewall off to see where the delamination started.
I had similar problem with ST tires. A cheap set of LTs lasted over 50k miles and after 7 years of use without any problem I traded the unit with them on. I have Chinese LTs on this unit now that are also 7 years old also with now issues.
A I know it is partly my fault for pulling as fast as I do (65-70), but I'd rather spend my time camping than on the road. When I drive from FL to AK I always carry at least two spares.