A couple of photos of mine. You can see the drum retention (washer and a knot in the rope). There is plenty of room on the drum even with approx 7m of 6mm rope on it.
The winch holds it tight against the post, I also have a slack 12mm nylon rope with a carabiner on it that acts as the 'check chain' to guard against failure of the winch ratchet, it is nylon so has a bit of give in it rather than stopping the boat with a bang as a chain would. Always have this connected when the trailer is out of the water.
There is also a ratchet strap pulling down and back to tension it all and stop it from bouncing, and also keep the boat from moving up the bow snubber if I have to stop in a hurry. Two more ratchet straps on the transom eyes to keep the stern from bouncing. I find the mid sized straps that are rated at about 2.5 tons are the best option, the big lorry straps are too bulky and the toy ones that you use on a car roofrack are not man enough for the job.
A Boat is a hole in the water, surrounded by fibreglass, into which you throw money...
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