Just bought the Kumho 857s for my TT through Tire Rack. Two days and I had them installed and balanced. Great experience. Had them shipped right to a local Goodyear store and they did the install. I'd use both again, excellent service.
Apparently these tires are not available locally and the local guys couldn't order them (or didn't want to be bothered) I even had one guy insist that I tell him the aspect ratio before he could look it up. The tires are sold as size 205/14 C trailer use only. They are load range D however (2271lbs at 65psi).
Leaving Thursday on our first trip with these tires. The original Chinese Trailmasters only lasted about 1700 miles and didn't even make it a year. One was replaced under warranty with a cracked sidewall but they were wearing so fast that I decided just to step up and buy the Kumhos. Hopefully I won't have to worry about it for a while.
By the way, the trailer is a 2012 Gulfstream Visa single axle and right at 3500lbs GVW ...