Re: Tires as Fenders
If you decide to leave the tires at the dock, I would recommend retying them to the boat when you get back. If they are securely tied to the boat, it will scuff your topsides a lot less as there will be much less relative movement between them and your topsides. If you tie them to the dock, your boat will have a lot of relative movement and it will make the aesthetic issue much worse.
I have never seen the steel belting come out of a tire but I could certainly see it happening. The worst thing that I have seen was someone who used studded tires without realizing it on a wooden boat. We used to use fenders in the summer and tires for the winter so the scuffing wasn't a big deal for us as things would get painted as soon as spring rolled around.