Large crocodile clip for hanging.
Just saw this thread P.E.T.E. Hanger which links to
It says "Squeeze it to put on and squeeze it to take it off (takes about 1 second).", seems to me it must be a mechanism like a large crocodile clip like the ones used for car batteries. Those clips are very powerful so would put some great pressure on the inner structures. You could fix typical hanger "walls" (like Piets ridge design) to the clip so it is not causing too much pressure on one place.
The "average size" is usually over-estimated. Small guys don't take part in surveys and big guys jump at the chance.
Girl claims she had a huge ex? Stick a spider in the bathroom or a mouse in the kitchen and when she comes out screaming ask her how big the spider/mouse was...