This is a bit of an odd one. I bought the remains of a Camp Tourist trailer tent many years ago to build a kart trailer. It was great until the wood went rotten so I then cut off the top leaving a 73x31 inch box which was handy for moving fence posts etc. This didn't like being outside much so all that is left is the frame and ends!
I had trouble with the wheels which turned out to be the same as fitted to a Trabant so I fitted Renault hubs and wheels. As can be seen in the pictures the suspension is a bit out of the ordinary but with a bit of weight it rode very well.
Might suit a tow car with swing axle suspension possibly for matching camber. Really need to move it as I need some more space, thanks for looking.