Perhaps so, but they are what came on it new from the trailer factory in South Dakota! Little 225/75R15s.The Goodyear endurance on my 10k rated trailer, have a 60 psi max tire pressure.
And that’s what I run them at with good results.
Seem like your way over rated on your tires.
I'll pull the trigger on the Goodyears in 2025, as we plan to pull the camper all the way to Yellowstone and Glacier then. That'll be a 4-5K mile round trip pretty easily.