The standard jack supplied with most four wheel drives can only raise the vehicle sufficiently to change a tire on paved roads or hard packed surfaces when the vehicle is not bogged. They usually rely on placing the jack under the vehicle in special spot on the frame or unibody. If you try using this type when you are bogged to the chassis in sand or mud you’ll understand why it’s quite inadequate.  The TJM Recovery Jacks can be used on any suitable part of the vehicle and can lift a larger amount of weight much higher than the standard Recovery Jacks .