cfg83: I feel for you. There is one leg of my drive that is filled with diesel trucks, but it is only for about 1/3 of my commute distance. A lot of them are getting cleaner, but some of them still spew the black crap. I just keep my windows up, and my air system closed off (not turned on).
My roll up windows come in handy when one of the spewers comes along though... I can roll those babies up pretty fast in a pinch. Try THAT with your automatic power windows!!
I'm a roll-up window man myself, but I got my SW2 used, so I was stuck with automatic windows. I hate to admit it, but I am actually getting good use out them for cross ventilation.