so after all that, i decided to go ahead and purchase...nothing. Decided to use the factory rack and tie down both sides, then bow and stern lines. That all seemed to work ok. Granted, it moved a little on me from the wind, but the weather was a big factor and I am not planning on transporting the boat in those conditions again. I think I will end up using a towel to add friction between the boat and rails to prevent any slippage. Thanks to everyone for the advice!
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