I am not good at all the technical advice here but I’ll submit real life, no BS, experience. My truck and trailer together weigh 22,000lbs. In 10+ years and over 100,000 mi I had 2 tire problems, 1 the whole tread came off of the tire but it was still full of air and the other was road debris. I tow level, check air often and here is where I lose all the “experts”. Other than what came on the trailer when new I have ran 235-15 Good Year wranglers from Walmart. This is a 3 axle trailer. I once had a trailer that blew 9 tires in th 6 months or so I owned it, don’t know why.