The VW camper van thing is very easy once you know how. Sideswiping the other vans (not too hard, though) is the trick to overtaking them without getting disqualified. Also draft/slipstream as much as you can. It make a huge difference.
If I can get to 2nd place by the end of lap 1, anyone can!
Edit: Also Don't use the brakes apart from when approaching the Hammerhead. I just release accelerator and then sort of slide the car sideways, then accelerate when I am facing the right way. Not sure what the technical term for this is (powersliding?).
rp2000