The Bell factory never closed, they just shut down the wheel loader line. Bell is still going strong, just switched to Deere. As for the triwheelers, probably the best selling Bell machine out. They just recently launched the E series of loaders, they have enclosed cabins and what not, though the feller buncher set-up is very rare here, I have never seen it before, but I have seen a Hyena debarker on a triwheeler though, somewhere near Sabie.
The ADT trucks are made in Richard' Bay, but the cabs are made by a company called Global Composites. If you drive past their factory, the cabs are all that you see.