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> make a seat that can slide to the side

I wonder if that would even be sufficient. The sloped sides mean that even if the driver can sit directly next to the window, there's still a hard limit on how close he can get to whatever he is next to.

Not to mention skirts and tails on the trailer do more to improve aerodynamics than truck modifications. Still, every bit counts I guess.

And the only time I see those tails unfurled is when it's an owner-operator driving at 55 (they know they're getting paid by the mile and so run as fuel efficient as they can).

A teardrop has a "relatively flat front end" just as every rounded shape has a point where its tangent plane is vertical, even a sphere, the "less flat" shape I can think of! It doesn't mean you can place a vertical windscreen in that point and still claim you're copying a teardrop's shape.