Barge with Tugboat

I decided to design a barge for the make-it-float challenge. Barges have been used for thousands of years to move things, so why not? My barge has a compartment and two bits for tying off. It is able to support $14 in cargo!

Since I made a barge, I needed a tugboat to push it along...

Note: The barge has been changed from the picture to match the tug. The bits are separate pieces, there is now a deck to match, and the bottom is no longer curved for better printability.