My previous trailer came with 15-in Goodyear marathons. I went through about 20 tires before I finally switched to 16-in red ball tow masters.
When I ordered my current trailer back in 2015, I specified 6,000 lb axles and 16-in rims with load range e-tires

I see that the load range f 12 ply rating and the load range g 14 ply rating are very readily available for not too much money more than the load range e 10 ply rating. That is why I'm wondering if there's any reason not to upgrade?