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Hucho's book/ caravan trailers
I looked at Hucho's book last night.His trailers are generally the same as the two under investigation.And according to Hucho,the 1st trailer would actually have the car/trailer lower drag,around Cd 0.45,based on the frontal area of the trailer.
The 'aero' trailer car/trailer combo would be around Cd 0.53.
The caveat is that the 1st trailer would reduce tongue weight with speed,the 'aero' trailer would be dead neutral and pull well under all conditions.
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