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When I spoke of discussing existing designs, I was really commenting on the picture posted by gascort (no offense intended!). It is basically a redesign that would have to be done by a manufacturer, not a "mod" that we could apply to current designs.
I know I was critical at first, but I have come to see some good use for an accordion style kammbak for flatbeds. It would be much easier to use with a flatbed than my design (which is intended for vans). To load overlength rebar on this design all you have to do is collapse the accordion down so that the rebar's overhang clears the accordion. To do the same with my design would require removing at least the side panels, which is certain to be a chore for the driver (and would require the liability of them using a ladder in the rain), and likely the top piece as I am uncertain that it would be very useful without the sides in place.
Nylon is certainly light, but will it fray when it flaps in the wind (while the accordion is in the contracted position?)
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