O contexto é outro, mas o conceito é parecido:

Establishing local networks to facilitate freight cost sharing: Trade is a scale business; a half-empty ship costs exporters much more than a full ship. A truck that is full one-way and empty on the return journey costs more than a full truck both ways. With weak trade among many African countries, the cost of shipping small consignments of manufactured goods goes up, as ships have to operate at reduced capacity or exporters have to bear the cost of getting their goods to a busy port. Even when working efficiently, transport costs can often be prohibitive for new firms. Building local cooperation on shipping logistics (in which firms share containers or larger consignments) can help to reduce costs and spread the risk of major shipments. Freight sharing can be facilitated either by creating a common central platform where firms can post their shipping plans and find partners with matching needs, or by more aggressive approaches, such as developing warehousing capacity for AGOA-utilizing firms, where the warehouse can centralize freight plans. https://www.tralac.org/news/article/10561-making-the-best-of...

freight cost sharing: https://www.google.com/search?q="freight cost sharing"

Freightage means cost or charge of freight.

Otherwise, courtesy of our ProZ regulars, freight or freightage split was the term we used in UK export practice.

Sugestão, o termo é possui uma grande frequência de uso.