I *think* they're supposed to open at 8, but as loads of ferries have already landed by then, I think they open when the queues on the roads become dangerous.
The site opens at midday, so it really depends on how long you want to queue. The priority parking place is near the front of the car park, which is nice, but you may find that the queue of people goes a way back, so you'll park, unload and have to walk back to the end of the queue. Or, send a "short-straw" person to sit in the queue with minimal stuff (a chair and some beer) whilst everyone else waits at the front by the car! hahahahaha
Plum Tree - Star Wars Weekend
Joanne and Bees Wedding - some island that isn't Wight