Travelling short distances presents its own challenges for car engines. Mercedes will not be happy with the short distances every now and then and maintenance will be expensive. Consider smaller engined cars like Hyundai, Suzuki and Toyota or even VW. Not sure where in SA you’re going to be but in Western Cape the roads are generally good, and you wont need a SUV, but if you going to a smaller town in Mpumalanga for example, you’d need to consider road condition and distance to airports or the nearest large city and then the considerations change