What is the axel rating and what is the axel weigh of the TT.
Across the scales, my loaded for the road TT weighs 6400 lbs. 750 lbs. are on the tongue 5650 lbs. are on the dual axels. The axels are rated 3500 lbs. each or 7000 lbs. total My four D rated tires have a total rating of 8600 lbs. I bought D rated tires because they were only $20.00 more a tire.
The GY Endurance is the latest and greatest on the RV scene. How they will hold up is anybody's guess but they are a premium tire.
Some people seem to have disproportionate issues with tires, the rest are happy with the 2,000,000 tires a year the TT makers supply.
I put 20,000 miles or so plus whatever the previous owner added on my China bombs, I traded then because they were seven years old. I can tell you from experience that road hazards do not care how much your tires cost. :)