Powered Rough Terrain Stackers: When goods have to be transferred over uneven and rough surfaces, look no further than the electric powered rough terrain stacker. With its large front and back rubber tires this unit can easily be used both indoors and out. A multi-function driving handle features an infinite speed adjustment, simple controls for finding the perfect height, and an emergency reverse function. Forks are adjustable to precisely fit what it being maneuvered. And, even more, the unit is equipped with batteries, integral battery charger, and battery level indicator. Manual Rough Terrain Stackers: A rough terrain stacker is capable of going where other stackers can't. The manual design benefits the user by giving precise movement of the unit in particular areas. A simple handle pump lifts and lowers, without the need for mechanical power. Just a simple hydraulic action leads the forks up or down to the desired height. The rubber tires provide stability when traversing rough or uneven surfaces. Baked in yellow powder coat finish.