public void setSuspensionDamping(float suspensionDamping) {
        tuning.suspensionDamping = suspensionDamping;
    }
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 expanding.
See the comments for setSuspensionCompression for how to set k.
@param suspensionDamping the suspensionDamping to set
jme3-jbullet/src/main/java/com/jme3/bullet/objects/PhysicsVehicle.java