Actually, my next computer for the truck won't be a laptop. I've been looking into car pc's. These are computers designed to run on the 12v system and can handle the dust, bumps, etc.
Here's the computer:
http://store.mp3car.com/Mp3Car_Custo..._p/ccc-121.htm
The monitor will probably be a 19", possibly 21". I'll add a second video card to it to run the touchscreen monitor I already have in the front.
With everything needed it should cost me in the range of $1,400-1,500 to do it, which is what I paid for my laptop.