FWIW, I have ONLY rotated front to back, as recommended in the Toyota owners manual, and my Bridgestone Duelers have 70K on them. still have 1/2" of tread depth as well on the edges. Even wear. Rotated every 10K. Towed 10K miles with 6000 lb boat. The key, imho, is tire pressures. I check mine religiously twice a week. I run MAX psi.