rack system you are using. I've never used crossbars longer than 48 inches. My best rack setup when carrying two canoes was on station wagons with roof rails. The crossbars could be firmly mounted with substantial fore-and-aft spacing, and the roof rails allowed supplementary snub lines to prevent canoe movement fore and aft. With that arrangement, I would mount the first canoe over on the passenger side of the rack, and I would tip the other canoe up with its inside pointing at the first boat. Good tie downs, snub lines, and end lines, and there was no problem.
But recently, we've used a series of Accord sedans, which means towers and clips. I firmly connect the crossbars to one another, which makes the whole mess much firmer and less likely to drift. But I admit some reluctance to carry two full size canoes, especially on our '08 Accord, where the bar spacing is only 32 inches. I would NOT use snub lines with a tower-and-clip rack, but if gunwale brackets are used for the first canoe, the second will sit tighter. Then I give extra attention to the end tie downs, seeing that there is a triangulation force pattern pulling the bows and sterns not only downward, but inward toward the axis of the car.
2-3 Canoe/Kayak Trailer
EZ-Dock modular docks
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