I went to GY 614's last year after a Marathon blowout plus damage. Didn't have to upgrade wheels
and damage repair was minor.
My brother just ordered 4 new Sailun S637 and new 17.5" rims rated at 125 lbs. for his Cyclone TH from Trailer Tires & Wheels in Edon, OH for $425 each including shipping, mount & balance & new center caps w/lug nuts. He should be getting them on Monday via truck freight.
The Sailuns are made in China but, his research at several heavy equipment manufacturers/suppliers showed the majority of the trailers he looked at had Sailuns on them. His own former employers 20 ton equipment/paving machine trailer had Sailuns.
Just more food for thought.