When hauling large volumes of concrete, a Mixer Truck (in-transit mixer) is a must. The concrete must be mixed and kept in a liquid state. This is accomplished with a cement mixer, which is a rotating drum and is mounted to a truck frame. The drum must rotate continuously during transport. The concrete can be place already mixed, or it can be mixed in the drum itself while transporting. Concrete tends to set very quickly, so these Mixer Trucks do not generally travel very far. Visit Construction Equipment Guide to locate used Mixer Trucks for sale.