public void setSuspensionStiffness(float suspensionStiffness) {
        tuning.suspensionStiffness = suspensionStiffness;
    }
Use before adding wheels, this is the default used when adding wheels.
After adding the wheel, use direct wheel access.<br>
The stiffness constant for the suspension.  10.0 - Off-road buggy, 50.0 - Sports car, 200.0 - F1 Car

@param suspensionStiffness the desired stiffness coefficient
(10&rarr;off-road buggy, 50&rarr;sports car, 200&rarr;Formula-1 race car,
default=5.88)
jme3-jbullet/src/main/java/com/jme3/bullet/objects/PhysicsVehicle.java