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Trailer, I've had a few record trips towing various trailers.
I think especially with a Prius where the roof shape is critical to drag, you'll see a big hit if anything is ruining airflow attachment.
On a big boxy vehicle it wouldn't matter as much, but again the boxier shapes mean the trailer follows in the vehicle's wake.
We know that it's at least possible to make a trailer that improves economy- I've never seen that with any roof mounted accessory.
Plus, I never feel 100% safe with a load on the roof.
Last edited by oldtamiyaphile; 12-20-2017 at 08:39 PM..
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