1. In my demo there is car_taxi.ini file , in this file all my car configurations exits. This jeep is car_02. You can see my car's configs there. Gravity is - 380. My roads are made with shaded block, big fields are made with flat block.
2. Why you did not notice any bouncing ? Please ride with high speed. It will happen like there is small object on the road and you go over it.