The present invention comprises an input drive system, which provides a plurality of phases of oscillating fluid flow, and an output drive system connected directly to the input drive system that is powered by the plurality of phases of oscillating fluid flow. Due to the fact that the separating piston is predominantly or completely made of a plastic material, it can be provided with a very light weight reducing the overall installation weight of the piston-type accumulator. The system includes a hitch offset assembly that offsets the axis of the down tube of the gooseneck section of the trailer from the axis of the hitch ball of the hitch of the towing vehicle.