tHE DART hull caps will rot every three or four years. If the boat was left unattended and has been sitting full of water for three years you may have problems... especially after freeze thaw cycles.
Check the glass at the bottom of the hulls on the keel line... If it's soft... not so good...
The hull is stiffened with large foam blocks which are glued into the boat... if these come loose.. (it's like loosing a bulkhead) The hull could come apart in big seas.
Scooby's advice is spot on
Mark