My guess is that if you take a close look at the tires you have on your unit now, they were made in China. If you have gotten 13,000 miles out of them, consider yourself lucky. I just replaced 5 of my tires [3 exploded, one leaked down all on the same 400 mile trip] with Akuret tires that were also made in China. My tire dealer gave me a 4 year warranty knowing I don't put many miles a year on them. This is the reason I always carry two spares. I'm 8,500 lbs. GOOD LUCK! Stick with ST tires, IMHO
2013 Silverado 2500 HD Duramax/Allison Tuned
Aviator Wright Flyer #1919
"First In, Last Out". 11B4Y
DAV, MOPH, VFW, 5/7 Cav,1/8 Cav Assoc.
11th ABN Pathfinder Co. N7MIP