I have notice this trend. Tires used to last longer before the sidewalls went to hell. Modern compounds? I had to replace the original tires on my F350 after only 80,000 miles and 12 years, just because the sidewalls looked horrible. Tread was just fine, could have gone another 40,000 easy. The Goodyear Marathon trailer tires seem to last longer, and they make a big deal about the extra lampblack or something in the sidewall. Why don't they make other RV tires with the same ideas? So they can sell us more every 5 years I suppose....
