How about making a bar you can mount on the surfboards say two strapped on crosspieces, then tie down the bar to the car when you need it . I'm picturing a prototype with a two by four strapped across the surfboard and then the ends of the two by four fit under the front to back bars on your rack and a bolt on the outside overhanging slightly piece would prevent them going sideways, you could put the board on the roof, slide one side under, then center the board so both cross pieces are secure and drop the pins on the outside to center and secure, or make a belly pan surfboard , LOL
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