English to French Bus/Financial Business/Commerce (general)

Here is some information about DieselC that could provide more context:
Dieselcure is a patented chemical formulation which is unique, in that it complies with diesel fuel specifications worldwide (SABS certifications available), a requirement of all original engine manufacturers, guaranteeing the absolute safety of using it in any fuel quality management system. DIESELCURE is compatible with diesel fuel and does not adversely affect fuel stability, performance or fuel-system components

And here is the sentence in which the requested term appears :

"In order for a Cargo customer to become a regular and consistent user of Dieselcure, IT IS VITAL THAT THE CUSTOMER IS ABLE TO JUSTIFY THE FINANCIAL COST OF USING DIESELCURE!"

I hope this is enough context?

I do not know how to translate cargo customer. The internet hits give 'freight customer' but I cannot find the translation for either of these terms in any of the dictionaries.

Could an expert out there, please help?