Amanda, maybe this can help,
I have a friend who does this:
1. On returning to the dock, back the trailer into the water close (1-2 feet) away and parallel to the dock.
2. Run the winch line out far enough to reach past the end of the trailer and take the hook with you onto the dock.
3. Secure a stern line with enough slack so that the stern can be pushed out from the dock 8-10 feet.
4. One person pushes the stern out the other keeps the bow close to the dock, or one person, push the stern out first then go to the already secured bow.
5. When the bow is close enough to the dock to reach the bow eye, secure the winch line hook to it.
6. Return the boat position to parallel with the dock, and centered over the trailer.
7. Winch it onto the trailer and secure it with the safety chain.
This system will work with either a bunk or a roller trailer. (His is a roller system). Hardest part might be that you may have to lay down on the dock to reach the bow eye, and then get up. :wink
I have a bunk trailer, and generally with it backed into the water until the tops of the fenders are submerged about an inch, I can pull the boat up onto the bunks close enough I can reach the bow eye from standing on the trailer tongue. I don't have, but have seen, trailers with a bit of a catwalk built onto the tongue to eliminate the highwire balancing act there.
This was an early launching. I later learned to back down to where the rear pickup wheels are just at the waters edge,and that puts the trailer where the wheel fenders are just covered, and the boat goes both on and off much easier.
Harvey
SleepyC :moon