I've heard that Yakima had a rack/rails, and I've been meaning to look into it. In the meantime, I've just been using foam blocks for my standup paddleboard, which is 29 pounds and 12 1/2 feet long...So your surfboard should be just fine on that! I like the fact that it's not a permanent fixture, and that when I want to take my board off, I just chuck the foam blocks and ties in the trunk, and my car is back to normal.
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