In reply to Alastair R:
Quite a few vans there when I stayed this Easter. Camping has changed from a voluntary $2 per night to a compulsory $5 paid online per tent per night. This leaves vans in a bit of a grey area. Technically you could keep a low profile and change your parking spot now and then and not be required to pay a fee. The ranger does come around now and then but is quite nice about it, and is generally looking for people with tents who haven't paid.
If you want to make a more comfortable set up eg van + tarp + tent + slackline + couch + BBQ etc you may be quite happy to pay your $5 and be completely legit. There are toilets and tank water but you won't get a power hookup. November is a great time and probably not too busy so you should have your pick of sites at Pines, Upper Gums & Lower Gums.
FYI - the usual van companies for travellers are Juicy and Wicked campers.