Can you not simply use a simple brake on the wheels? I'd not want to put things that could be trip hazards on a public footway, you are most likely to get sued by somebody. The usual reason for bins walking about is the bin collectors not having the brains to put them back from whence they came. I needed to mark my bins tactilely, and asked the council, initially they were not happy at me doing anything but the calmed down when I pointed at the Equalities act as at present they are only different in colour which is not much good to a blind person. I ended up drilling holes in a flange to a code. This also means I know when its somebody elses bin not mine!
Brian