If your Euro Truck Simulator 2 is missing a heavy duty truck, then the Euro Truck Simulator 2 Mercedes-Benz Actros MP4 mod is for you. This truck is a serious beast, normally used for transporting freight and for construction haulage.
Installing Euro Truck Simulator 2 Mercedes-Benz Actros MP4
The mod comes as an MP4, which you must decompress with an app like WinRAR. Then copy the files to the Documents / Euro Truck Simulator 2/Mod folder. If you need detailed instructions for installing a mod, have a look