I am not doing it, either. Just piling on Blue's comment of the truck you have versus the truck you don't and that to get the truck you don't means you need to spend 70k.I get that you already own your Sequoia, but much like you have a hard time with new car prices, there is NO way I could throw $20k at Sequoia add-ons.
My Sequoia has about 130k miles on it, but I am more confident in adding 200k miles to it than any other car I could buy new right now, including the new Toyota Sequoia. If I were to drop the supercharger idea, I could spend 10k to make it really capable if I really wanted to.
I have been checking out what Tandem off road puts together for the Sequoia - pretty impressive stuff.