I guess that is a little bit interesting. I was never a fan of those flimsy 'bolt on the cabinet' cart things. They get beat to hell quickly, and they don't have good stair walker systems for dragging up and down stairs or over curbs. Also, makes getting a cover for it kind of hard, although maybe they will come out with one that allows you to use the cart.
I would think most would be better off with the standard RS210, the RH450 and a good quality cart like the Kart-a-bag Super 600.
This is a good point, and I also like your idea about using modular rs112s.
Speaking of which, same question as I asked above about the 210: How big a place could you play with the 450 and a single 112 and still feel full and heard?

