Barnacles and Critters
There's a tendency of growth finding its way into the centerboard trunk as that's not an area that gets bottom painted easily. Raising and lowering the centerboard will prevent things from getting encrusted. You don't want to get your centerboard jammed and not be able to raise it when you need to. Also, if your mooring area is subject to weather, there's no need for the board to get all that unneeded stress. My two cents - raise it at the mooring.
