Sailun 637

Me.
You can get them in 80 and 85 series - so try to match what you've got already. My guess is that they are taller than average spec due to tread depth.

I replaced factory tires with 637s as soon as I bought the trailer. I can tell you that the weight difference was 35lb (factory tire) to 61 lbs (Sailun).

Yes, they are from China.
Yes, they have a very good reputation.
They're imported by TBC Corp who owns a bunch of American tire stores, so they are backed by a real company here in the USA.

I'd buy them again in a heartbeat.

I just got off the phone with someone about these tires and he told me that these are from China (he said all ST's are from China or out of the country) and that yes, the Goodyear G614 are American. He said these were 10 ply compared to GY 14 ply. They both had a five year warranty on them. It's hard to resist the price of these compared to the Goodyears, I'll tell ya that.

Not sure I can do it though.

Anyone else have any info on the Sailuns?

Been using these tires since Apr 2013, not the first problem. I was at a RV show in Florida and found that some new 5th wheels are coming from the manufacture with the Sailun S637 on. They are starting to see the light.