If the weather looks bad, use spring-lines from the bow and
stern to dock amidships of the boat. Tie up on the
downwind side of the dock. If the wind is changeable,
place fenders over the side between the boat and the
dock.
MOORING
After you have positioned your boat next to the dock, you
must secure it with mooring lines to keep it in position.
Mooring lines must be long enough to secure your boat
wherever it may be docked. For example, the length of the
lines for a 20-foot (6.1 m) runabout should be at least 19
feet (5.8 m). An eye splice at the end of each line works
well with bow or stern cleats.
https://www.boat-manuals.com/lund/