For those of us doing a total refurb, building a cradle for the boat works best. Others have reinforced their trailer with additional support for the bottom of the hull. I chose a cradle because my trailer is too long to fit in my garage. Included wheels to make the boat more maneuverable while working on it and assembled it with lag screws for easy tear down and compact storage. What you do depends on the amount of work that needs to be done and your personal preference.
Here's a couple of pics of the cradle. Not the most detailed but gives you an idea of what i have done.
Hope this is helpful.
My boat'n buddy Ethan installing pads to protect the hull.
Here you can get an idea how the hull is supported.
