I live in the mountains just west of Denver, and drive down to Denver and back and all over the mountains all the time (skiing biking hiking camping wheeling etc). I have an 01 non TRD with a 4" DB lift running 295/75/16 with no S/C, a topper, loaded down with crap, 4X bumper, roof rack, 3.4 5 spd. So lots of weight and drag, on 4.10 gears. There are a few hills where it sucks, by which I mean I have to go into third to maintain 60-65 running 3500-4k RPM. And sometimes going into the wind or up a steeper hill or loaded down more it's closer to 50-55mph. Basically that's Mt. Vernon canyon going from Morrison to Gennesee, a quick bit of Floyd Hill, and a few places on the approach to the Eisenhower. Everywhere else it does just fine.
Now that you have that info, yes, sometimes I would like to have a faster truck. Of course then I would probably just get speeding tickets because as it is I can do 70-80 most everywhere. No, I would not trade the capability of the Tacoma on Colorado's usually smaller trails in for something bigger, especially if said rig was nicer and I was less inclined to beat on it. I think S/C would be the way to go; I've thought about it myself.
'01 Taco, DD, 33's, dented armor, squeaks, rattles
'80 Pickup, 35's, locked, armored, geared, lifted, and does ok when the hubs are locked in.