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@Rowan42
So far i have only made the coupling device which will provide a quick release between the frame and the trailer and allow for free movement on every axis. I made this from a heavy duty low level castor wheel with which I welded a snap adaptor from an air compressor providing a strong but quick releasable connection. (I got this idea from a youtube video i saw)
I have done a few sketches for the structure of the trailer and have amalgamated the best elements i have seen from various designs. My main inspiration has been the "flatsy" from http://bikecart.pedalpeople.com:
I'm planning to make mine out of conduit like the flatsy. I am designing mine to take a good 80kg so it can carry a human but i don't know if this is a bit ambitious at this point.
If anybody has got any experience or advice, let me know.