The marina at Edmonds is a regular source of interest for me.  They have racks on which the boats get stored in multiple levels.  This requires a method for moving and lifting the boats and this is a bunch of specialist fork lifts.  They have very long arms to support the boats and a high extension to get the boats to the upper levels and also provide clearance over the racks when maneuvering the loads in tight spaces.  They must be pretty heavy to provide sufficient balance when picking up the boats.  Watching them wobble around is a little strange but entrancing.