Raise-a-dock did our two 40x6’ docks last year. Couldn’t be happier with them. Facing east on Wolfeboro Bay so we get a bit of direct wave action on the weekends. Whips attach directly to the aluminum posts and hold a 27 foot with no noticeable lateral movement to the dock. They feel like permanent docks but easily crank up and down for winter. I imagine a 30x4 would be a bit less stable - agree with Dave M. that 6’ width provides more utility and stability. 2 Adirondacks can sit side by side at the end of the dock with no issues. Good luck with the decision!
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