On my second season with the Kuhmo 857's, and I like them. Seem to tow very well, they build pressure with road heat-up, but no more than 10 psi, and I've had no problems....
One word of caution/advice (that I got from others, and am just passing along): Look for the psi rating on your TT wheels. Some are only rated at 50 psi, which is well below the 65 psi that the 857's run at.... I also changed my valve stems to the brass type to accept both the higher pressure and the TPMS senders.
2014 RAM 2500 Laramie 4x4 Quad Cab w/Cummins Turbo Diesel, 2009 Rockwood 2607, and 3 'yaks!
300W of Suntech Solar, a Rogue MPT-3024 Controller, and a Xantrex PW2000 Inverter