Do these "spoilers" really help???

[Sven7]

Make a topper in this shape and you'll be golden. If you can't afford the materials or time, buy a sheet of plywood and secure it over as much of the rear of the bed as possible.

[JasonG]

The air bubble is a weird thing.

Mine moved and helped out when I added a tool box http://ecomodder.com/forum/showthrea...mod-14920.html

I think it moved it back, when I was forward the air flow was not going over the tail gate but was partly impacting into it.

[Otto]

Seems like those little internal ramps might help a bit with the circulating bubble, making it somewhat better than a naked truck bed, but not nearly as good as a properly faired and tapered bed cover as done by others on this website.

For the faired truckbed cover, instead of plywood and 2x4 lumber, why not Coroplast with stiffeners inserted into the flutes? Lighter, maybe cheaper, could flatten out and carry in the bed when not needed.

[brucepick]

Originally Posted by Otto

Seems like those little internal ramps might help a bit with the circulating bubble, making it somewhat better than a naked truck bed, but not nearly as good as a properly faired and tapered bed cover as done by others on this website.

For the faired truckbed cover, instead of plywood and 2x4 lumber, why not Coroplast with stiffeners inserted into the flutes? Lighter, maybe cheaper, could flatten out and carry in the bed when not needed.

1/8 inch diam steel rod fits the flutes perfectly. They do a nice job stiffening it up. (Viagra for coroplast???) (Sorry, couldn't resist that one.)

Haven't checked to see if they are rusting but I don't really care. If they rust away one day I can get more. If you're really concerned about rust I guess you could prime them, or put silicone sealer over the ends of the flutes where the rods are.