Anyone else going through trailer tires this summer?

My 2021 United super hauler 28'x8.5 came with West Lake Super ST (10 ply) E-rated. Trailer is 6385 empty. Fully loaded I estimate it to be approximately 10,000lbs conservatively. Car is 2640lbs empty. Quad is 350 lbs dry. Plus 15-20 gallons of race fuel, 5 gallons of pump gas, predator 3500 generator, tools, spare parts, etc. I put between 11,000-12,000 miles on the trailer and knock on wood have had good luck with these tires. I did however find two big gashes on the inside sidewall of my driver side tires while adjusting my brakes before heading to Norwalk this weekend. One was so deep I could see the belt. Luckily they didn't blow while towing and I caught them. I am biting the bullet and putting 4 new Advanta ST235/80R16 (14 ply) G-rated tires on tomorrow so I don't have any issues (knock on wood) before towing 215 miles one way. Hopefully they last me for the foreseeable future.