I put pillow cases on my carboys, which are also on dollies. Well, the last one that I had break, the pillow case wrapped around the wheel of the dolly when I was moving it and pulled the carboy to the cement. Of course it was my best wine that year. Took over 4 hours to clean up. Not quit as bad as when my then 3 year old opened the spigots (just enough) on my fermentation tanks just before we went upstairs for the evening.