Have you looked at Swamper M16's? So far the best ive used for a DD and rock crawler. There also the quietest MT i have run thus far, which im surprised cause its a swamper. I have run, Iroks, GY MT's, GY MT/R's, GY MT/R's Kevlar, TSL bias/radials.
Heres my set of 37 13.50 15R on Interco Birddog Wheels