almost anything can cause a Klicky to topple over, especially if the surface it is on is even slightly uneven.
Norwich market in the UK has a similar arrangement of fixed roofs for the stalls in its market:http://www.visitnorwich.co.uk/assets/Uploads/businessimages/_resampled/SetRatioSize1024768-norwichmarket008jbp.jpg
This is an issue. I will be making a separate post about it in the near future.
I was just looking at Norwich market on Google Earth, playmofire! Sort of permanent stalls made to look like the old fabric-roof-flapping-in-the-wind style?