[Fulltiming]

Class 8 semitruck/trailers have the opposite problem faced by most RV'ers. Truckers wear out the thread on their tires and put on recaps in a short time period, frequently a matter of months. Most of our tires sit and the sidewalls crack and they age out with all to often no visible thread wear after 3 to 5 years. Is it legal to recap tires, certainly but you don't want to do that on an old tire carcass. The tires on Class 8 trucks are probably less frequently overloaded than RV tires. A semi may weigh 80,000 pounds but that is spread over 18 tires. A Newell may weigh 50-60,000 pounds spread over 8 tires.

You are correct that high speeds are really hard on trucks as well as RV's. I am unaware of any truck/RV tire that is rated for speeds in excess of 75 mph but we see trucks/RV's traveling at speeds in excess of that on the interstates frequently. Hopefully every truck/RV driver checks their tire pressures daily. I typically shoot all my tires with a laser thermometer at rest stops during the day to insure the temperatures are similar. Additionally, sitting for a lengthy time is hard on RV tires. That is a problem that truckers rarely experience.