After 200k miles, I realized (confirmed really) it was the seats in the Tacoma that were really hurting my back. So today I did something about it. I love the truck too much to sell it, so I got a pair of seats from a 2002 Toyota 4Runner and went to fixing them. 3 of the 4 mounts bolt up in the original holes. So after cleaning the carpet and new to me seats, I removed the problem mount, and rigged a new one. The odd issue was the seat belt receiver, they are different sized, so I had reuse the Tacoma's. I can already say it is a great improvement, but still not as cushy as the Land Cruiser.