I lock it to the handlebars for easy access and convenience. Also the main reason to rubberize. Picture me rolling ;)
I'd been kicking this lock around for a while till I found a good use. In my area, all that is really needed is to thwart a thief from actually riding your sled away, is a stop to it from rolling away. Without wheels, there is no getaway! This is a quick solution using a VERY LARGE lock.