Step one carefully remove the boat from trailer.
Lower trailer tongue to the floor with a floor jack and cribb the transom.
Use the trailer center jack and floor jack to lift transom off the trailer. Cribb the keel up behind trailer cross brace. This will allow you to move the trailer 2-3’ forward. Re-cribb behind the next cross member and repeat. This will take several set ups to completely remove the trailer from under the boat. Be sure to chock trailer wheels when lifting. Re-chock after each move.
Use cribbing on the bunks to help with the last setups.
This is a safe and secure way to suspend a bass boat. Take your time if you attempt this procedure, and a buddy to help a plus. Starting demo and re-build this week I will post progress. List of updates. New treated bunks with Gatorbak covering, new fender plywood and carpet covering, trailer corrosion and repair.