When tying up with other boats, I always use hippity hops. I keep a 12v pump on the boat and inflate them when needed. They are about 15" in diameter and keep the boats apart really well. I have some 6" taylor made fenders, but they aren't enough. Some larger fenders would work, but I just don't have the storage space for them. When tying up, I hang a hippity hop off the rear cleat and one midship off the tower or cleat. I tie a rope to the transom eye and another off the bow eye.