a small mixer vehicle structured as a trailer has clutching mechanics for frictionally revolving a rotatable drum during towing and for both manual and powered auxiliary drum turning when the trailer is parked . for manual drum turning , an attachable crank is provided . the crank attachment also accepts connection by a hydraulic motor which is remotely powered by an auxiliary pump . the trailer drum support structure has mechanics for placing the drum in a tilted position for unloading and for returning the drum to a horizontal towing position . a tow bar attached to the trailer includes adjustable mechanics for leveling the trailer .