Not very likely that someone would have a camping spot and no car, but it's worth a shot.
I am planning on leaving immediately after work (5pm) on Thursday, and returning late Sunday night, as I have work first thing Monday morning. I can comfortably fit 3 people, maaaybe 4 if you don't mind being squished in the back. If you have a camping spot, you ride free! If not, just pitch in for gas.
I'm in the West LA area.
It also helps if you are of drinking age so we can take more alcohol in.