Your thoughts please

[The Hutch Man]

I suspect the reason you never found one is because it would be impossible to make! At 8x8 or similar, it might be possible to fold it but it would be far too heavy to move, and as soon as you tried to move it, you'd end up splitting the wood or breaking the fixings on the folding hinges. I reckon the only way you could do it on that size would be to have it put together in a way that means you can easily dismantle it between uses, potentially by quick release clips but then that would risk making the run itself less safe.

I have made a few 8ft x6ft x 2ft high folding runs.
I would say this is the max in one run as yes they are heavy.
Mine are very strong but are not for the faint hearted when it comes to moving them.