transporting a sailboat via container ship
What you may have heard about is a special floating drydock ship. It has a gate in the transom that the boat all enter through. Then the gate closes and they pump out the water while divers fit poppits or cradles under the boats to hold them upright. When it''s not needed for moving damaaged ships around, sometimes they schedule a transatlantic run (I think it''s owned by a Dutch outfit. ) so that 20 or 30 boats can sail at Cowes or the Nioulargue without having to do the ''pond themselves. Not likely to be doing the East Coast, and especially unlikely to be headed into the Gulf, but you could try a Google search to see what you can find out. It will NOT be cheap. A delivery crew would be the only other way to move the boat w/o unstepping the mast. Other than that, trucking would be the way to go.