Defenders aren't good on road, but are sensational off it. Discovery IIIs are nice but very BIG. Toyotas LCs are less reliable than they used to be, but Toyota may still make more basic LandCruiser models for the African market. An important consideration is availability of spare parts. Toyota has a plant in South Africa turning out pick ups, and a 4x4 HiLux doublecab might do the job. That's the vehicle Clarkson drove to the North Pole a year or so ago.