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I think in this case the rearal area is key, as the tow vehicle is blocking frontal area in ways which may not be clear cut i.e. if #2 has 25% more frontal area does that mean it is presenting 25% more area to the wind? Not this time.
So I think aero load differences tween the two will be very minor compared to the functionality of them (which one suits your needs better?) and of course the price.
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