If it is on a roller trailer it's easy, a bunk is much harder.

I had a 23ft Fourwinns on a roller trailer, I removed it each fall to clean
and wax the bottom. I tied the stern to a cleat installed on the concrete
wall in my garage to stop the boat from moving forward and slowly pulled the
trailer forward until I could get wooden blocks under the transom corners to
support the stern as I continued forward with the trailer. I blocked the
bow as far forward as I could just as the bow began to drop from the
trailer.

To put it back on, I put the trailer back up to the boat and used the winch
to crank the trailer back under the boat. (It helps if you have someone
GENTLY reversing your tow vehicle at the same time.) It's a good workout
for your heart but it always worked fine. I have a 27ft now on a bunk
trailer, I have to have it removed by the marina with a travel-lift.

Good luck
"tjf" wrote in message
...
It is a 21 foot Fiberform cuddy cabin. I would guess that is weighs around
2000-2500 lbs.

Tim



"Dave W" wrote in message
...
You do not say what the boat weighs and that is important. I take my
Bolger
skiff off the trailer every year for bottom sanding and painting. I
jack
bow up, place strong timber thwartship under the bow and support the
timber
on two sawhorses. These are spaced far enough apart to allow the
trailer
to
pass between them. Then I jack the stern and place on two sawhorses.
Its
just a matter of pulling the trailer ahead at that point. Hope this
helps.
Dave
"tjf" wrote in message
...
I am interested in the process / steps for getting a 21 foot boat
off
of
the trailer so I can paint it and also rework the trailer. Is there a
web
site that explains this (with pictures I hope) and also might suggest
what
materials and equipment might be needed?
I have heard from individuals on how to support it by using a
floor
jack
and wood. What are your opinions.
Thanks in advance.

Tim