Mike S,
Drop me your e-mail & i'll post you a video of the whole operation.
If someone knows how to post it online, go ahead by all means.
The towbar does not interfere with the PDC at all & I wouldn't know about a manual system as I don't even use the electric one on my CT, it was on the car when I bought it.
Very very simple mechanism though & well hidden.
Hope this helps Mike S.
Here are some photos