I often get a couple of backpackers travelling with me more for company than fuel subsidies - I seem to have a bit of luck putting a note on Gumtree (Rideshare). Never have I seen any notices in Caravan Parks.

General notes for Ride -sharers:
Security and compatibility are always concerns with any strangers this is why I pre-plan to whom I've got in my car - You must be prepared to be up front and open kimono with prospective travelling companions - also Police should have some way of knowing with whom you are travelling - leave photo copy of their passport and/or licence details with reliable persons that will react if you are missing or out of contact for a couple of days.

Spoke to Lions Den but only about accomodation--reason I wanted
some one who stayed would give a customer veiw not management
veiw.

Will sus those other links to "car share"