Thanks for all of your advice! I'll call the Showgrounds as well as didn't think of that.
We are actually going to Coffs, Port Macquarie, Lismore, Byron, Murwillumbah, Glenn Innes, Armidale (Petersons guest house have a Tesla charger), Hunter (lunch at Petersons with charger!) and back to the Central Coast (around 2000 kms). Due to time restrictions (when we need to be home by) and kids we are a bit limited to how often we can stop and charge, so leaving it plugged in at friends during the day and overnight (on 10amp) to keep it topped up and when not using it is the plan, plus Macadamia Castle when possible - however they have said if the weather is bad / storms etc charging may not be possible (as its all solar) so I do need to take that into account.
I'm sure I will work out some way to get it charged as much as poss in Lismore. Either way if anybody knows / recommends anywhere I could securely park for a few days (unable to get it up friends driveway), let me know.
On a side note I saw that Lismore council have bought themselves a Nissan Leaf which the mayor etc is using around town...plus I believe they charge it off solar - and doesn't the Nissan Leaf charge off a J1772 socket? (Which I have an adapter cable for)