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Securing centerboard when trucking a vessel
Down. No question about it. But it doesn''t need to be fully extended, just lowered onto a secured board or blocks.
My boats'' swing keel weighs 1500 pounds. When moving along the highway the loading on the lifting and holding areas would be too much for it (and unnecessary)if it was "up". The other end of your centerboard (pivot point) is most likely just fine no matter where the rest of the board is positioned.
Block it where it meets the transport trailer and maybe even a chock on either side to prevent lateral shift if you think it may do that.