Clip a long dock line to the bow eye of the boat.
Thread the dock line through a 2-by-3⁄8-inch pulley.
Fix a short dock line to the pulley and girth-hitch to the trailer axle.
Tie a bowline knot on the end of the dock line, 2 feet above the pulley.
Pull off the winch line to reach the loop and clip it through.
Crank the winch to pull the boat backward, off the trailer.