Euroliner or not

milodon:
The difference between commonly used UK and continental trailers then, as pulling ferry or rental trailers mean having a crowbar and a sledgehammer on you at all times to get them loose after the locking mechanism has been hit by a fork, bending it out of shape.

Wouldn’t know about that. At our place we use Schmitz Cargobull Euroliners.
The uprights are locked into place at the bottom, exactly the same as that Krone upright. But the top is only jammed in by your curtain tension, there’s no locking mechanism up there.
I’ve never seen a Euroliner with the top of the uprights locked into place and I’ve pulled a lot of different makes.
Usually the side boards keep them in place as well, but if those are left out for some reason, the uprights do move.