Timetable: You can se here how it was done in Sweden at the Pilot race.
http://www.myrcm.ch/de/ets/20110401_..._WD/index.html
Friday was 2wd, Short Course, 4wd in each round.
But saturday and sunday was like 2wd and Short Course in the first half of the day and 4wd in the second part of the day, worked very well.
So you did not have to change car every 30 minutes.
We will do the same at the DHI-Cup so you can run both classes.