The re-Cycles shop has received a few trailers this year. One of them was an older Chariot model that had been modified in a very familiar way. This design would originally have the wheels outside the frame using single-sided hubs (like a wheelchair). For whatever reason the previous owner decided to use double-sided bike wheels, which meant added more framework to hold them. And it looks like he was possibly inspired by my trailer webpage or the DIY trailer posts on this blog.