-- Last Updated: Oct-23-13 5:34 PM EST --
... my reasoning was as follows, though I didn't think "really carefully" about the dimensions, it was just a quick notion:
Likely distance from thwart to closest crossbar = 2 to 3 feet.
Likely distance from stern to thwart = 2/3rds the length of the boat, or something like 10 feet (this assumes that the rear thwart is likely to be behind the rear crossbar, and therefore not useable for this purpose).
10' + 2' or 3' = 12' or 13', which now that I actually see the numbers (I didn't give it that much thought the first time, and now that I look at it I don't think all the numbers are even close) gives a total length that is at MOST roughly six-times longer than needed. It's no big deal really, but since you asked, that's the rough idea of how I pictured the extra length, simply picturing a boat on the roof but not actually quantifying any lengths in my mind.
And like I said, I'd trust your roof rack a lot more than most.
Recreational Kayak Paddle
Free Standing Boat Racks
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