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I see these things all the time.
They must work.
With the miles a truck puts down even a tenth of an MPG can have a big effect on the bottom line.
Nice thing is they are cheap enough to put on almost every trailer or container flat.
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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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