REA22 Center Of Gravity

The goal of this mod is to make the game feel more realistic and
customizing the vehicle for the task more rewarding.
The goal is to make the mod universal.
This mod supports multiplayer and dedicated servers.
No changes in XML is needed. Some data from XML is overwritten!
Center of gravity is changed based on the position of the wheels axis and radius:
Typical center of mass is 25cm above rear wheel axle.
Wheel width and twin wheels now effects stability:
- Wider tires or twin wheels for more stability
- Narrow tires for less stability.