From the mod description:

"If you have all the DLC and are using Promods with Middle East expansion, choose Cheaper Ferries – Promods".

Hope this helps.

Greetings, so I'm using your economy mod along with all DLC's and Promods. Do I need to use both of these (Cheaper Ferries - All DLC and Cheaper Ferries - Promods). And would there be a specific load order? Haven't used a ferry yet, just trying to avoid a conflict when I do. Love you Eco Mod by the way.

From the mod description:

"This mod reduces all ferry costs in Euro Truck Simulator 2 to 1/20 of their base game value. For example, a ferry that costs €1000 in the base game will now cost €50."

what is Cheaper Ferries ?