In Oman, car tester Emmanuel Schäfer takes the VW Amarok through an endurance test. His route leads along the coast, over the mountains and into the desert. Normally, the Amarok’s default is rear-wheel drive. Off-road, the press of a button is all it takes to switch to all-wheel drive. And if the going really gets tough, the 4-by-4 Low Mode is the way to go.