I have made the decision to replace my GY Marathons (E)rated tires on my 15000 LB fiver. I am also replacing the wheels with 110PSI rated wheels. I'm leaning towards going with Sailun 637 235/80R/16. ...
Jim, like you, I threw away my factory tires and went with Saulin's. The difference in weight per tire was about 35lb to 61lbs. I think they're a great deal.
People will point out that they're made in China, but these things are built like 22" Michelin, steel belts, I'll buy them again...