Just in case it's not obvious to everyone, you get much better control of your boat if you use dock line that is long enough to go from the bow cleat to
the stern cleat . Make sure the line is connected to stern cleat on the side facing the wind and or current. Using this method you avoid the free swinging stern that results for using only a bow line. I made up a line to fit my boat with a loop in both ends. I put this line on in the parking lot and wrap the slack around the winch post , back the boat down, unhook the safety chain and winch strap and then let the dock line slip on the winch post to control the boat as it slips off the trailer. Then you can tie you boat to the dock by using a dock cleat or post positioned midship . This holds both bow and stern securely.
I am sure this is not news to most of you but I am amazed how many people I see with an 'out of control" stern blocking the launch ramp.