I assume the large hose clamp is for your water intake hose that attaches to the hull intake on the starboard side. Mine has 2 clamps, I think yours should also. You wouldn't want that hose to pop off, your boat would sink fast.
I'm surprised they didn't remove your batteries for winter. I always put mine in the house where it's warm, hit them with the trickle charger once in a while.
I was njskier on here.