If you are unloading at your own dock you should build a lift to get the fish box on the dock. A 4x4 with a cross piece on top at a 90 degree angle that sticks out over the boat. Then put a pulley on the cross piece and mount a boat trailer winch on the down leg and run the cable through the pulley. Rig up a cable or heavy line with a hook on each end to attach to the handles on the side of your cooler. Then you could hook up the winch to the cooler, jump up on the deck and winch it up, swing it over and let it down on the dock. I probably didn't explain the device well, kind of like those winches that fit on your trailer hitch of your pick up you hook up a deer to and crank it up and swing it into the bed. The older you get, the easier it is to throw your back out. Ask me how I know.