Last year I had installed a new axle
on my trailer and decided to add 14 inch wheels and tires
as well...anyway, I still have the tire/wheel that was used as the spare.....if anyone would want it, it is: Goodyear Marathon + rim, ST 175/80R13.
I'm not sure the age of the tire because it was on the trailer when I bought it....the road tires
were Cooper so I expect the previous owner had replaced the spare at some time. I can tell that the tire/wheel I have never been on the road. If you're willing to pay shipping from Grand Rapids, Michigan, I'd be more than happy to send it.