It's simple. You offroad in it, it breaks, the dealership pays for any drivetrain repairs that weren't from obvious abuse.
I was with my buddy in his BRAND NEW (as in right off the dealer lot) 2004 Jeep Wrangler when we snapped a rear axle in two seperate pieces. He got it fixed free. 2 weeks later he blew the engine, fixed for free. About a month later he snapped the front axle completely in two, they fixed it for free, voided his future warranty, and called him an idiot. lol