In October of 2020, WE bought our first 5th wheel, a 2015 Heartland cyclone 4150. From what we can tell, it was left on a seasonal site since 2016. I am thinking the tires are original, and although t...
"But sometimes I wonder if the common knowledge "ST's having stiffer sidewalls" was untrue."
As is usually true, common knowledge isn't so common, and in this case, also untrue. When I changed out the E-rated ST tires on my 5th wheel for G-rated LT tires, I was particularly impressed with the flexibility of the sidewalls on the ST tires. "Wet noodle" was the term that cam to mind.