Wouldn't it be hard to turn this trailer sharply, since the hitch doesn't allow any side-to-side movement? Would it be helpful to keep the u-bolt slightly loose to allow it to rotate about the seat post?
Why does the hole have to be in the bottom of the tube? Thinking about it, wouldn't you want it on the top so that gravity helps the media enter the tube?
It'd be nice to see a video or at least an audio recording of the difference in noise before and after that addition of the vibration dampeners!
Yes, the hull is not very hydrodynamic, but we didn't have much choice then; as high school students a boxy shape was the easiest to build, as we did not have the equipment or tools to steam and bend wood as a professional shipbuilder would.