The Camco Jack Stand is a heavy duty, durable way to stabilize your tongue without the need for heavy cinderblocks or wood. The sturdy base has a weight capacity of 5,000 pounds, but is lightweight and easy to store. The recessed dock supports the weight of the tongue, preventing it from slipping and evenly distributing the weight, helping it to not sink into soft ground. Camco's Jack Stand is made of UV stabilized resin for many years of use. The Jack Stand is not designed for use with a wheel-equipped tongue jack.