It is kind of a long story, but after running the Pirelli Scorpion ATRs for a couple of weeks, I ended up with a set of Nitto Terra Grapplers. The Pirellis were fine. I thought they were very stiff, and handled very well. I never had them off road or in the snow. They were very quiet on the highway. My only complaint was that they looked much narrower than other 255/55-18s.
The Terra Grapplers are very nice. They handle good, but are not quite as stiff as the Pirellis. They are a bit noisier too, especially at lower speeds, but considering the tread pattern it is surprising they are not noisier than they are. They are great off-road. I went over Cinnamon Pass and Engineer Pass this weekend in a rain and hail storm, and they were impressive. A guy in a Jeep asked if I was ok. Like he had ever seen a Touareg off-raod.