There are lots of tire threads but things change sometimes. If you upgrade to 14" wheels/tires then you can get the new Goodyear Endurance
tires that are now made in the USA but they don't make any in a 13" size.
We have 14" Carlisle radial trail HD
tires on our 16'
Scamp, but they also have them in the 13" size you probably have. They have an 81 MPH speed rating, which I hope means they are built a little better than the average Chinese tires on the market today.