Check out some pics that 2 of mates and I did in December 2006 (with 2 pillions. My fiance, and Albert's wife) The pics are here:
https://picasaweb.google.com/hvanderwatt/BikeTripAroundSouthAfricaDec2006
It took us 3 weeks and 5500km to do this trip on 3 identical GS's from JHB to Bloem...