The THD-2500 hydraulic truck vibrator from Cougar Vibration is designed to create more force per size/weight. Providing lighter weight and a lower profile, the unit offers ease of installation. The high-strength aluminum housing provides maximum durability. Requiring no lubrication, maintenance is minimal. It is a direct bolt-on replacement, providing variable speed and continuous duty to increase unloading efficiency and speed, while eliminating the need for manual truck bed clean-out. 800/544-2947; www.martin-eng.com.