Caravan (camper trailer) spoiler (deflector on tow vehicle roof)

[skyking]

I think the projection above that you had there is not going to help as much as a projection to the rear, tailored to allow the trailer to turn. Couple that with a vertical splitter as suggested above and you would have something to measure over time. The vertical splitter will help in the crosswind conditions we encounter on most days.

[kurzer]

here is, what the setup was about, ( but without the trailer):





i will not build big (ugly) things for this trailer, its not used too often and in good shape. the roof spoiler was an attempt. next step will be a partial undertray...