public void setSuspensionCompression(float suspensionCompression) {
        tuning.suspensionCompression = suspensionCompression;
    }
Use before adding wheels, this is the default used when adding wheels.
After adding the wheel, use direct wheel access.<br>
The damping coefficient for when the suspension is compressed.
Set to k * 2.0 * FastMath.sqrt(m_suspensionStiffness) so k is proportional to critical damping.<br>
k = 0.0 undamped/bouncy, k = 1.0 critical damping<br>
0.1 to 0.3 are good values
@param suspensionCompression the suspensionCompression to set
jme3-jbullet/src/main/java/com/jme3/bullet/objects/PhysicsVehicle.java