I managed to break the bed last night.
The two legs that support the central support bar which runs down the length of the middle of the bed broke.
Each leg was a hollow tube, with the 6mm insert which was tapped M6. On one of the supports, this insert had come out entirely. On the second it twisted in the tube.
I decided that I would cut the tubes and insert a 3-4 ish cm shouldered steel bush.