The GP-350 is for those looking for a larger unit than industry standard. It is versatile for medium to high pressures, as well as medium to high volumes. This unit comes with a 10,000 (950LPM) psi triplex pump for using in higher pressure situations, a T&E pump to load or unload fluids at high volume. Note that the plunger size on this piece of equipment can be swapped out for lower pressures and higher volumes.
Also, this unit has a decent capacity for hauling fluids, with a 12 cubic meter 2 compartment hauling tank.