Tested the tires at Disney this weekend. We did a mix of climbing solid rock ledges, rock boulder crawling, and some muddy trails which were straight up and down (ask anyone who drove them) and my STS' never slipped once. They outperformed my truck! During the trail run, we crawled up several crevasses which were very deep. Once the truck was level in the crevasse, you could stand under the rear bumper in the center of the crevasse! So, you definately needed side bite to keep centered. They never once slipped. We drove trails with 44" tire sized ruts. On several occasions I tried to climb out of the ruts and all it took was a turn of the wheel and it would steer out without a problem. I aired them down to 8 psi and the sidewalls flexed very well. They are spongy at this pressure, but work great. I am very impressed with the performance of these tires. In fact, I may sell the Boggers and run these full time. There were several "Seasoned" wheelers on this run and they are impressed with these tires as well. I will try to post photos adn video of the tires in action.