I would not recommend running 2 hoses off this machine. The GPM would be cut in half and the unit would not be very effective. I do not recommend running 2 hoses until you jump up to a skid mount unit with 5.5 GPM or higher.
For the surface cleaner, I would recommend the BE brand model BE-2000WAWS. I have attached a link for you to view that item.
BE Surface Cleaner