Schattenjager,
Did you regear your Taco after upgrading to 255/85/16 size tires? I'm asking because my inlaws live in Evergreen (which sounds like the area you describe when you say near Denver), so I'll be making frequent trips up the hill and before I go to that size I was hoping to get some feedback on tall tires and high altitude. I know tall tires will slow me down a bit going up I-70, but I don't want to have to drive in the right lane all the way up the hill either. My truck is a 2008 Double cab with the off road and towing packages.