A concrete slab leveling apparatus is provided that is built upon a vehicle such as a flatbed truck or trailer which makes it highly transportable enabling the invention to move from site to site quickly and easily. The actuator 130 includes a movable portion 130f which moves translationally from a first position to a second position when a voltage is applied thereto and which returns back from the second position to the first position when the voltage is removed. Viable propionic acid bacteria and a lactic acid bacteria culture are orally administered to a ruminant to dramatically promote the proliferation of the propionic acid bacteria in the ruminant rumen, and to thereby increase the volatile fatty acid concentration in the rumen for the prevention andor treatment of rumen acidosis in the ruminant. The generator provides direct, simultaneous AC and DC voltage outputs without requiring an inverter circuit or a converter circuit.