Portable work platforn . This was used to move a back hoe over to an island recently to do some work. It worked flawlessly.. Could be shaped like a horseshoe for a dock or slip. There 2 4 foot x 4 foot x 30 foot units and 1 4 x 4 x 20 foot unit and 6 aluminum 2 by 2 foot by 6 foot out rigger style floatation /stabalizers that bolt to the right and left side to stabilize the platform when its in the water. 15000 obo