A trailer 1 comprising compacting means 18 and conveying means 49 transporting compressed material away from the crusher. Preferably, the compacting means is located at one end and the conveying means transfers material toward the other end of the trailer. The conveying means may be a slatted belt. The compacting means may be moveably or pivotally mounted and may be a first bulkhead which compacts material against the floor of the container. The compactor may be moved by a hydraulic ram (28, fig 8). The conveyer may be responsive to a pressure sensor in the compactor, and may be moved by a hydraulic motor. A second bulkhead 19 may be pivotally joined 40 to the side walls 15. The second drive means and conveyor may be responsive to a pressure sensor that monitors the pressure of the material against the second bulkhead. The trailer may have a sloping base (fig 11). A method for operating a trailer is also claimed.
