(Setting the Zones)
You make a rumble track the same way you do any other track. That is, you must edit the terrain and paint it with textures. And, you must place the trucks around the summit area on which the actual rumble will take place.
The scoring areas are created by using two object boxes whose type is set to check point. Just as in the case with regular circuits and rallies, check points are actually just special models with the property type set to check point. You must insert the object box into your track at the center of the summit. Do this the same way you would for object boxes at the base of check point flag poles or the base of trees. For details please see here.
For the scoring area, insert the first box like this:
Now open the properties box.
In the properties box, set the type to check point and the sequence
number to zero. The size may vary depending
on the size of the summit you make. Click OK.
For the summit area, insert the second box like this:
Again, in the properties box, set the type to check point and the sequence
number to one. And, again, the size
may vary depending on the size of the summit you make. Click OK.
This box is used to determine when you hear the buzz when a truck gets knocked off the summit.
Correction - Nov '01
Previously, I said that there was no need to define any courses for rumbles. That is NOT entirely true. The race cam, blimp cam and helicopter are controlled by the courses. Of course, helicopters do not work in rumbles but the cameras do. So, please, to make sure you get all truck views and camera angles, set the main course and extended courses in your rumble track. It does not really matter where you place them. Just put them somewhere close to your main rumble area. The track will still work if you do not set them, but you will find that certain camera angles will show you as if your truck is under water, or worse.
Update - Jan '02
Failing to set the extended course can result in the track flooding after a crash. There is no way around this problem except to end the game. We now have even more reason to set the extened courses in all types of tracks.
Lastly, remember to position your trucks.