Super Transport series
From Wookieepedia, the Star Wars wiki.
The Super Transport series was a series of large container ships produced by Kuat Drive Yards.
Ships in the Super Transport series were boxy, slow, and carried no weapons or shields. They made up for their shortcomings with their exceptional cargo capacity, but required escorts for protection against pirates.
The Imperial escort carrier resembled the Super Transports, and was probably derived from their design.
