Traveller vehicles and starships

  I have finally obtained the bloody Traveller and started designing vehicles.
Since the largest ship seen by me so far is the Atlantis battleship (of R. S.
Dean's fame) I have decided to try my hand at a ship exactly twice as large
(and of the same TL).

  There is little doubt that this creature will be rather heavy and cost
like hell and (what's more) guzzle fuel like a Russian farmer during May day.

  Since the ship is large and cannot make refueling runs, how the Navy feeds
them?

Marc