Room divider on wheels docking

[aceparts]

I have a large and heavy wall unit that has been fitted with wheels in order for it to act as a mobile room divider. As it would be incredibly dangerous if it fell over I want to be able to lock it to a couple of walls. Anyone have any ideas how this could be achieved neatly? I was thinking along the lines of a large bold that could be slid into a socket mounted in the wall.

[shirt]

if it's stable [i.e. bottom heavy - remember for it to topple the CofG has to move outside the base] then you're worrying unnecesarily. any solution will require something attaching / drilling into the wall making it look odd/ugly when the divider isn't there.