I've used the 2x4 method, two, only attached with a pair of u-bolts through each board. You have to drill, so slightly more work than hose clamps, but I'd have to think more solid.
That was on a old Rav4, where the racks are less than the width of one canoe, and only about two feet apart. We carried a pair of 17' boats. It looked freaking ridiculous and it really didn't work that well in our case, because we were carrying the boats upside-up and filled with gear. Oh, the racks were fine. It was us that was the problem, and a several hours long drive across rutted dirt roads. By all rights, should have been a disaster, but we made it okay.
I would have suggested this earlier, but the legality is questionable, depending on the state and the size of the car. Many states limit how far the bars can overhang.
Dock & Launch Systems
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