I took a lot of inspiration from this thread, so I wanted to post my success with a trailer that I rescued off of craigslist and refurbished.

I'm pretty sure it was a custom made kid trailer from who knows how long ago. There were no branded markings or tags, only EMT stamped on all of the tubes. Which I know now is used for electrical conduits. Whoever made it did a really nice job with the welding and making the sides removable. The design looks a lot like the one from this guy.

So anyway, it went from this-



To this-



I removed all the old canvas, re-greased the hubs, added a lollipop ball mount to fit my existing chariot hitch, gave the frame a new coat of black paint, weaved on some nylon strapping, and bolted on a nice Plano plastic trunk.

I couldn't be happier. This will work nicely for having some flat bed space, along with a lockable storage trunk compartment while doing errands.