The Abnaki Class is a container tug based on the frame of the Excelsior Class Heavy Cruiser and is capable of hauling two containers on its underbelly and can also transport an extra two containers should then be attached to the ends of the two that are docked directly with the tug.
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This is named for the Abnaki Class Tug that was used by the US Navy.
https://en.wikipedia.org/wiki/Abnaki-class_tug

Also, the containers had been drawn by adrasil over at DeviantArt.
http://adrasil.deviantart.com/art/T.....-Pod-616396171