A rough road is the best way to test the toughness of your car, but if you can avoid it, try not to do it as that is a sure way damage your car. Most of the time, the damage can't be easily seen as it is the car engine that usually damaged. It is not easy to detect that damage since it can't be seen.
Drive your car as fast s you can till you get to the finish line. That is the main idea, but doing that is another thing since the road ahead won't make things easy for you. You need to climb mountain after mountains to reach the finish line.