I am planning to get a Hymotion Plug in Conversion on my '08 Prius soon. Any thoughts on whether or not I should upgrade the suspension? Would upgrading the suspension increase the car's load capacity, compensating for the weight of the new equipment, or just improve handling? Seems like I remember reading that even though the conversion adds about 200 pounds, it is effectively more like adding 300 lbs. Anyone else see, or understand that?