Thanks for your input, Dave M. The way I am looking at it the way the floor is already built is "overbuilt" for this situation. If I am looking at the numbers correctly then this span of floor should hold over 10,000lbs. Of weight evenly distributed over the joists. I don't know where to go from here as far as overbuilding it more. What would I add to make it stronger? I saw your post about the vertical blocking. I suppose that would mean building another wall 30" out from the existing wall?