public float getMaxSuspensionForce() {
        return tuning.maxSuspensionForce;
    }
The maximum distance the suspension can be compressed (centimetres)

@param wheel the index of the wheel to modify (&ge;0, &lt;count)
@param maxSuspensionTravelCm the desired maximum amount a suspension can
be compressed or expanded, relative to its rest length (in hundredths of
a physics-space unit, default=500)
jme3-jbullet/src/main/java/com/jme3/bullet/objects/PhysicsVehicle.java