Oops, need to correct a mistake I made in post #21 above - the patent by Bondo I listed is for his aerodynamic pickup truck bed extender. The patent on reducing drag on 18 wheelers with the box extension and vortex generators is by William Basford, number 6,959,958. Sorry bout that.
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Regards,
Carl Ijames carl.ijames xx@xx verizon.net delete the xxs
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