I have a new LSV coming next week. It is scheduled with the single bag system, and I am considering upgrading to the 3 bags, or installing 2 rear bags myself. How much do the factory 2 rear bags weigh....I think I read 350 each? I can order a pair of fat sacs weighing 540 each and install the pump. If I do this, how rigged up is she gonna be? Is it hard to install these pump systems? Thanks!!