Ford lengthened 50s-era freight ships used for hauling raw materials in the Ford River Rouge Complex an additional 120-feet in the 70s for increased capacity. [0]

Someone uploaded a TV special centered on the SS Byron D. Benson and its captain, in which he speaks to the lengthening and how it affected the ship. [1]

[0] https://en.wikipedia.org/wiki/SS_William_Clay_Ford

[1] https://www.youtube.com/watch?v=cFiF5LUsi1A