My advice is to do the tonneau. My tonneau gained me 1.5 MPG over and open bed.
Whether you go hard or soft depends on how often you need to pull it off to carry a big bed load.
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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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