We just park the sleds in a tight row, with the oldest sled in the front as close to a window in the room we are staying. Locks are a hassle. Insure sled and hope to get a new one is my theory. In the past we have had 2 sleds stolen. One in Wellston at the Deer Horn on M55 and one in Houghton lake at tip-up town on M55. Not a good feeling to find sled gone.