Abstract: A pump system has first and second pumps. Each pump has a housing, which housing has an inboard end and an outboard end. The pumps are arranged so that the inboard ends are adjacent to each other. The inboard ends each have a crankshaft, while the outboard ends each have an output manifold. Each crankshaft is connected to a plunger by way of a connecting rod and a crosshead. The crosshead reciprocates inside of a cylinder. The crosshead has an axis that is coplanar with a rotational axis of the crankshaft. The connecting rod is connected to the crosshead by way of a wrist pin. The wrist pin is offset from the cylinder axis in order to allow the respective pump to be compact in length. The first and second pumps are on a trailer. In the first pump, the wrist pin is offset on one side of the respective cylinder axis, while in the second pump, the wrist pin is offset on the opposite side of the respective cylinder axis.