Grand plans.

BYLINE: BY PETER T. LEACH

Trailer Bridge is thinking big. Encouraged by the success of the extension of its Puerto Rican service to the Dominican Republic, the Jacksonville, Fla.-based tug-barge carrier is considering new services to Hawaii and Alaska from West Coast ports and is even contemplating the possibility of starting service to a post-Castro Cuba.

"The available capacity of its fleet of tug-barge combinations gives us the ability to be about two times as big as we are today," John McCown, Trailer Bridge chairman and chief executive, told an investor's conference hosted by Jefferies & Co. in New York last month. He said the company is looking for ways …