Offering an actual html link for other readers would be most useful..
[& pictures that can enlarge]
seems many readers are willing to buy retail on-line from foreign sources, and have it shipped

[It was a book from UK Amazon for me.. to the US. ]


My sense of this ...
Suppose the thing is, if you piled a lot of stuff on the rear rack ,
keeping it from folding, normally
Experience has demonstrated,
the weight would topple the bike over anyhow, so You would be leaning it
against something on the left side anyhow..

And without the stuff on the rack,. you don't need the KS.
just touch the release lever ( if not turned so every time it folds.). and fold the rear under ..
but, I suspect, It is useful for the D'hon &Tern and all the other 'fold in half' bikes..




I have a trailer tow connection on that end of the axle, myself..

and I gain stability when I park the bike , by locking it onto something.