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Something more stable,would be to split a 8" PVC pipe and attach the halves to the upper edges of the trailer face.
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Hard to do since the front face has a curve in it.
That's a pretty small car towing that trailer, heh.
Those roof racks are interesting, but we aren't seeing what is happening at the trailer sides, with a cross wind, etc.
Isn't it true that almost any trailer shape generates lift? The way those streamers look in those pictures are similar to what happens with a wing. Added speed of air over the top causes reduced pressure, which means lift...