Trucks are the last bastion of full customization. With so many sold, hundreds upon hundreds of thousand a year, even with so many combinations the finances still work out because you're still so producing so many of each combination.
Not as efficient as it could be, but truck buyers really love it. Toyota went through a LOT to get the new '07 Tundra to have even a fraction of the options that the American alternatives have. It's just not in their mindset to do that, it goes against everything Toyota, one of the pioneers of lean manufacturing, believes.
