I have a 21 foot boat and have bunk racks on my trailer. I generally
operate the boat by myself and it is pretty easy once you get the hang
of it. I have carpet on my bunks and I generally unhook the front clip
when I back the boat down into the water. I tie a rope to the boat and
hook it to the trailer, once I back down the boat comes off, the rope
catches the boat, I pull it in, tie it to the dock, park my rig and am
set.

When put the boat back on the trailer, I back into the water with just
enough water on the back to allow me to drive the boat onto the trailer
and allow the bunks to catch to make the boat straight. I drive the
boat right up to the bumper on my trailer, turn the motor off, climb
down off the front, hook the cable and snatch it tight, and get in and
pull the boat out of the water.

If you have a roller trailer or clicks on your bunks, this obviously
will not work the same, you will have to keep your cable hooked on the
way down the ramp. When pulling out of the water with rollers you will
not be able to drive it up most likely unless you really sink the
trailer.

Hope this helps! If you are looking for a good fishing site that has
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Good luck!