Titan HD 2000 II SS or Carlisle Trac Chief R4 tires, Thoughts?

[5030]

Switched to Trelleborgs this spring from Titans. New shoes on my tractors are a major investment, over 5500 bucks for 4.

 

[Paystar]

Titan and Good Year ag tires are made by Carlisle. I don't know what is going on with them, mine all keep cracking and splitting on the sidewalls. And I don't leave my tractors outside in the sun when not in use. And I always watch pressures.
The good thing is even though the cracks look like they will split wide open at any moment, they never leak or fail and Carlisle has awesome warranty and they have replaced some of mine.