We have a '07 California and it came with the porta potti and the tray it sits in.
Now were not 60 (yet) but as far as I know, our toilet habits must be about the same!!
Its only a tiny unit and lets just say you would want to fall asleep on it but it does the job (or jobbie!!)
I don't like the way it fits under the sink but it has to go somewhere. Without going into too much detail, we put it in the boot when it's been "used" between sites where we can empty it.
Saying that, forget using it with the lower bed out but it's fine in the night if your only using the roof (when there is 2 of us). Oh, dont buy it as a option, I found it cheaper direct but you will still need to order the tray from VW or Brandrup.