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Yes, there is a thread around here on just this very thing. ( I can't remember what it was titled )
There is a European maker that has actually reduced drag by adding frontal area to the top of the trailer.
With a flat top trailer, you would have to add length or modify the rear of the trailer to taper the wake downwards.
With an added 'hump' the air follows over the hump and continues downward at a more tapered angle , but without any additional length - but at the expense of added drag due to added frontal area .
Does it ever balance out ? Not sure, but the experts seem to 'hiss' at any mention of frontal area being used as a means to reduce drag
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