Problems in south are strong sun light and humid and warm climate. Weapons against sun light are well done bright and paint work and right colour selection. A boat like Grand Banks 50 has lots of surface area so it would be a lie if I told you that keeping the boat in good shape won t take some time. Rot needs right temperature and moisture content to live. If both of these are low enough rot won t survive.
Good ventilation is the key word to keep moisture content in reasonable level inside of the boat.