Goodyear SA Update
I've had my SA's on for 1 month and about 1400 miles (stock size 265/70/16, P rated), so I thought I'd update my initial impressions.
They took a little getting used to at first. They were installed with pressure of 38 psi - I quickly reduced that to 35. It definitely made them ride bettter. At times early on, they seemed a little squirly on the road, but I don't notice it much any more - I think that in fact they are so grippy that they grab onto ruts and ridges and it feels like it makes the truck move some, but it in no way feels uncontrolled. The noise level is slightly more than the stock tires, but at this point I don't even notice it.
In the rain I've been very pleased. I've charged into deep standing water on the road, and it does nothing to the 4Runners traction or direction.
Last weekend I got off road on to a moderate trail, made a little tougher due to snow above treeline 2 days before. Parts of the trail were like a running stream, and there were many muddy slick areas, although no deep mud, and lots of stream crossings including some with steep exits that had large rocks preventing a quick exit. Regardless of the conditions, the tires (and 4Runner) did great! I had lots of grip in all conditions except in a few muddy spots, and even there, with a steady foot on the gas pedal and Atrac doing its thing, I kept moving ahead in a controlled manner.
While the truck feels a little sluggish off the line and to get moving on the highway, I think it's more perception than reality (I have a V6 and am in the Colorado Rockies). My mileage is totally unaffected - no change at all.
The only thing left to experience is how it does in some real snow, which won't be that far off.
Hope that helps some of you thinking about these tires.