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Many trailers use thin chains with an s hook.
I use a hook and a couple links of chain from a trailer hitch safety chain, 2000# rated.
I run the safety chain down to the tongue with a turnbuckle, as suggested here on iboats. I believe JB was the first member I heard mention doing this.
I also have added an extra eye to 2 of my boats now.
This frees up the main bow eye for the winch strap, and the launch line.
Makes thing much easier.
The turnbuckle takes about 10 seconds to tighten by hand, and absolutely prevents the boat from moving or bouncing.