What he said^^^^ Remember the interior and all fixings (including you parcel shelf) need to stay in the car. And make sure all the fuel lines and brake lines are protected (some people get them braided and run them through the car).
yea iv been told sucks abit. doing 12 car nav runs atm though so interior isnt a problem.
going to be doing a road rally in november but iv been told that alot of poeple just put all there interior in a pile straped down in the back somewhere if they have striped the interior all ready.
a tank gaurd is somthing i am going to try and sort out sooner rather than later.