A tipper is a heavy duty truck chassis fitted with an open-top body, used for carrying aggregate, crushed rock, soil and other bulk materials to and from construction sites. Tipper trucks normally carry bulk materials such as sand, gravel, grain, and even potatoes. They are usually loaded from overhead hoppers. At the destination, the back of the truck is tipped to discharge the load. The body of the truck is pivoted at the back. Typical length 7.9m (26ft) Typical width 3m (9.85ft) Typical height at rest 2.9m (9.5ft) Typical height at full tip 7m (23ft) Maximum vehicle weight 26 tonnes Six wheeler tipper trucks incur a surcharge.