Boat Towables How Can I Pull Multiple Tubes/towables Behind The Boat?

How can I pull multiple tubes/towables behind the boat? - boat towables

We have prevented a bathroom at the back that we meet with hooks on both sides of the stern. We have a hook in the top center of the fuselage, we now use yet, but we pulled two tubes. Is there a special cradle or cable can be achieved? The boat has enough power to throw!