Time for some new tires, I also recommend the Goodyear endurance in the d load range. Those Carlisle tires are a ticking bomb

and as others have said the additional damage they cause is real and something the tire shops care a less about as they push these off on anyone they can.
I just replaced my endurance after 5yrs, with zero problems. I would also recommend replacing any tires at 5yrs whether trailer, car or truck. 35yrs of driving and towing here in Phoenix has proven this to me on multiple occasions. Changing a tire on the side of the road when it is 110° out is avoidable, be smart and proactive.
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I was going to replace the following month, tires were 5yrs and 6months old. Quality bf Goodrich ko2. $3600 and 6wks in the shop for repairs.