Tray -
There have been several other discussions, which you can find with the Search tool. I don't recall whether anyone was successful. At very least, you would have to bring the weight of the kayaks down on the top of the walls. I don't think the flat part of the roof is strong enough to take the weight. So this would mean attaching crossbars to the top of the walls, rather than trying to lay the 'yaks down flat on the roofs.
Bill
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