I carry 1 or 2 kayaks on top of my Acadia on Yakima (bow down) racks - on their sides facing out...
Never had any issue with movement, etc - and certainly traveled at (over...) 70mph... I wouldn't be concerned with the same setup being towed - though that vehicle isn't my flat tow (can't be with AWD and automatic for that vehicle) - and my Jeep flat tow is a soft top, so haven't been able to haul them on that either.
Be more concerned with Canoe and how it straps down - as I keep a much closer eye on it while hauling on top (center, front, rear straps holding it against foam blocks on the rack.) I've had to stop as I've seen movement through the sunroof before.
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Greg
Not yet retired...
Florida (Michigan transplant)
2014 Hurricane 32A
2000 Infinity (previous)
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