Tough, tough, tough describes the Goodyear HMG 20/20 Bias ply tires. Best trailer tire I have ever used. D rated, made in Canada for U-Haul. (when you google them, the picture of the tread is not an accurate depiction.) I averaged 75 mph with an 8500 lbs gross weight trailer and the temperature per the monitor never went over 96 degrees. Pressure stayed steady also. Love these tires.
With two different trailers have had tread separation and sidewall bubbles on tires made in China with under 2000 miles. Just turned 4800 miles on my Goodyear HMG 2020 and they look like new. And let me tell you, the roads on this recent trip were ROUGH.