Based on the previous experience biking from Maastricht to Basel and back, we decided to redesign our trailers.
Most cheap bike trailers don't use a rear damper or a poor functioning system. Since we makers believe in circular design I wanted to reuse the old trailers. This also gave me a perfect project to improve my welding skills. Using a set of rear shock for mountain bike use, we manged to create a well functioning version 2.0. At the end we also tried to close off the side of the trailers, but this was a lesser success. If you're looking to start a similar project feel free to contact me for sharing my experiences.