EeZeBILT 50+ - these are not original EeZeBILT boats, but new designs to the same style as the 50 year old originals. Build and enjoy!
You have a barge - it needs something to tug.
Here is a simple design for a Thames Lighter - quick and cheap to make. They can be scaled up or down for other tugs, of course. Make several and run your own towing competitions....