hello Mr Palmer,
You’re not alone! try this website : https://www.caravanclub.org.za/
It seems to represent all the clubs in the provincial region of Cape Town.
I believe the Boland region are VERY active! i’ve just tried to join their Facebook page too! there is a link to inquire with them also on the page https://www.caravanclub.org.za/boland-region/
i met Andrew and some of the other members once at Dibiki quite a long time ago.
they looked like they were having loads of fun for their potjie competition!
I hope that helps 😉