Quote:
Originally Posted by mateospeed
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Yeah, match the streamlining on the front of the trailer with the rear of the tow vehicle .
Reduce the wake of the trailer a fair bit with a boattail.
I wouldn't flare out the sides much beyond the rounded corners of the trailer.
Add wheel skirts.
Make everything foldable, especially the top spoiler, so you don't have the extra drag of the increased frontal area when not towing the trailer.
If you make it so that the top spoiler and sides can angle down when not towing, you'll decrease the wake area and increase the MPG of the single truck as well.
Close the gap between truck and trailer with a vertical baffle plate on the trailer front - one on the centerline can go right up to the pivot point on the hitch, without interfering with turning and backing up.
More, smaller plates can also help to reduce the cross-flow.
If the set-up allows for it when turning, extend the vertical sides further aft to better close the gap between the truck and the trailer.
(only illustrated in plan view)