In Concur with Piece of Mind
The last thing I want to have happen (and do for that matter) is for the 'stang to poop out enroute, have it towed to a mechanics, then have me leave the con to pick up the stuff and people from the 'stang, deliver to the con, then enjoy the con, then have to drive people and stuff back to SF on monday before I then drive back to LA.
Now, I have no idea how reliable or not the 'stang is, which means I really have no place to talk, but I would be sad if it did break down and the above scenario had to play itself out.
It's easy to spend other peoples money, so I think you should rent the car!!!