I don’t think Goodyear makes 13” trailer tires. I would need new wheels.
, what is weight of loaded trailer w/ boat and how far out do you drive to take the boat out?
Upgrading to 14" wheels might be a pita regarding up front investment, but if you plan on keeping boat for awhile, it might be worth while.
Consider keeping an eye on FB marketplace, Craigslist, etc for a good set of used 14" wheels.
Many people buy new travel trailers/boat trailers and upgrade to new fancy aluminum wheels, and they will sell their original steel or basic aluminum wheels. More than likely if you can source some, there would be a good chance they have little or no mileage on them.
Local boat or tire shops may even have a sets of 14 inch "take-offs" from a new trailer their customer upgraded. You might can score some for 1/2 of normal new price.
Even a cheap set of used steel 14" wheels can be cleaned up and a couple of coats of Rustoleum will make them look new again.
Just my 2 cents..