What kind of truck do you drive, Windrider? Engine? Transmission? Gearing?
If you can't make a tonneau or sloped bed cover work...well that's trucking, but it basically shoots aero improvements in the head as the rear of any vehicle is the aerodynamic big enchilada.
Can you hack numerically lower gearing? I found that to be very effective.
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2000 Ford F-350 SC 4x2 6 Speed Manual
4" Slam
3.08:1 gears and Gear Vendor Overdrive
Rubber Conveyor Belt Air Dam
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