The one pic of the hitch-mounted connector does not look like the OEM westfalia connection. That said, you may be too focused on the connector and not looking systemically to establish whether you have an OEM setup. Lift the floor under the trunk area and take a picture of the electronics behind the spare tire, and lay down under the back of the vehicle and take a picture of the hitch - not a close up, get at least the middle third of the vehicle at the hitch. Post the pix. If you don't have an OEM hitch, you do not want to try and pull a car hauler with this vehicle. That's a serious, perhaps fatal, accident waiting to happen.
