This is probably a noob question. And as far as off road riding goes, I guess I am a noob. I see a lot of riders on this forum wallowing around the dirt and mud with HUGE bikes (BMW 1200 GS, Yamaha Tenere, KTM 990) and I was just wondering: 1. What is the advantage of a bike this large in an off road situation? 2. Other than speed and power on tarmac, is there really any advantage?