Because he does not "crawl." Most rigs on the trail cannot keep up with him and many driver's won't push hard enough to. I popped a kevlar on my first trip from a rock scrape and have another that became fubar'd somehow. I now run mine at 20 psi and so far so good and the extra psi does not slow me down on the trail. Matt said on another forum that he is popping tires after hitting something hard. His truck is heavy and I'm of the opinion that the tires are getting pinched. More psi will help with that. Time will tellDamn 20 psi!
I usually run 3 psi in the rear and 4-5 in the front haha. Why such high PSI out west?