I run BFG KM2s in the 255/85/R16. It was very muddy at the Lone Star Jamboree this weekend, and the truck had no trouble with anything. I have never had a better performing tire on my truck. The tall skinny tires don't care... they just go right through everything. Didn't get any pics this weekend, but there are some from our trip to Kiamichi trail the week before in completed expeditions. If you need better pics, send me a PM and I'll run out and snap some for ya.
I was worried that they would look weird from being so skinny, but this is not the case at all. They look like they belong there, and I am happy with their appearance. Great size, and great tires.