DC Truck Vibrators from Martin Engineering provide power to improve the speed and efficiency of unloading pumper trucks and other mobile equipment. Models are available to suit specific trucks and typical loads. They provide up to 3,200 pounds of vibratory force to assist in unloading wet, sticky, fibrous or even frozen material. The small, lightweight units require minimal space. A weatherproof aluminum housing provides a high output-to-weight ratio, and is sealed against dirt, dust and water. They come with shielded, oversized, permanently lubricated ball bearings, mounting hardware and electrical connections. Operators can choose a 12- or 24-volt motor. Models match the force to output requirements. 800/544-2947; www.martin-eng.com.