Tire size 245/45R20 I purchased a set a 4 Cooper Discoverer H/T Plus tires for my truck in 2022. I haven’t driven a lot of miles on them due to the fact that I live on the Island of Oahu, in Honolulu, Hawaii and have a lot of thread life left. I noticed that the sidewalls on 2 of 4 tires are cracking and separating. I removed them from the vehicle due to the risk of tire blowout and injury in the event of an accident. I’ve emailed Cooper tires for information and warranty resolution and have yet had a reply.