The Dunne Loadlugger 3c is a vehicle whose sole purpose is to transport raw resources from one destination to another. During early-game, they are extremely useful, however this usefulness gets diminished as more logistical infrastructure is built, and larger carrying vehicles, like Flatbed Trucks, are more widely available. Despite these downsides, they are perfect for quickly transporting resources from one point to another. This comes in handy with simple facilities, where cranes and small trains are not built.
While trucks should be stored within a Seaport or Storage Depot, if you do not plan on storing it in there, then make sure it is behind defenses with AI, as parking them in front will block their line of sight, making them unable to shoot targets.
Despite Coke being a product of another raw resource, Coal, it is considered a raw resource and can be stored/transported by any vehicle/stockpile using this