In days long gone bye, I used to sit at the living room window of my Grandparents apt. watching the tugs move barges and lighters around New York harbour. If there were just two barges the tug would be in the center of an inverted "V" with the stern of the tug clear of the barge hulls. Pilot house afforded visability to see over the covered barges if they were part of the tow.
Singles were snugged up along side and it was rare to see those harbour tugs with a tow astern. Even the tugs with several heading up( north ) the Hudson to either the NY State barge canal or cites along the way. The tug was affixed to the barges.
"Lord, grant that I may always desire more than I can accomplish"