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micksmith said..
Normal mate, as long as you have pressure on the top board you'll be fine. I've travelled to Newcastle like that with no worries. The bottom board may move slightly across diagonal but no matter, it can't fly out. If you are at all concerned just put a short tie down around the noses of both boards tied together on a long high speed trip, tail too if you're really paranoid.
Totally agree, even had a much thinner mal on the bottom, no probs. Travelled literally 000's of k's like this.