Your boat will move if a storm hits and the water lowers enough before the wave to bottom out your boat on the sea bed. it will edge out each time until it doesnt touch the bottom again. It can also be pushed around by sea serpants and trolls that dont destroy it.

Tip is build stone docking slots for it in shallow water so it can wiggle out during a storm or a covered boat house. That is really your only two options right now but i do agree we need some type of hitch to secure it to a dock or pillar.