Bought my first Michelin's in 1968 and mainly Michelin until 10 years ago... never again. Like MP1 when Michelin would not warranty their XRV MH tires that some actually had blow out sitting still... guess they were the lucky ones.
OP, today you have plenty of choices besides Michelin for a good radial tire. I've had good luck with Firestone steeltex/transforce on my PU... 3400 lb E rated tires.
Cummins12V it looks to me like you are running too much air in your dual tires or not decreasing the pressure when not towing... not bad for 40K miles.