the route through Kosi is fairly obvious - just a track really - splits all sorts of directions but eventually gets you to Ponta - but 4x4 required, (although some have done it without). Assume that if you are towing it may be a bit more difficult, but manageable. Whatever - its not far at all. I think it would be easier than coming through Moz - becasue all tar to the border from pongola
See route from map source attached -