However, there will be a Multiplayer for American Truck Simulator. zip format, unzip it and move it to “My DocumentsAmerican Truck Simulatormod” folder. How to install ATS mods in 4 easy steps: Download American Truck Simulator mod, the file format is usually. After that you need to activate the mods you want to use. Copy and paste mods in: C:Documents/American Truck Simulator mod folder. RAR archives into your “My DocumentsAmerican Truck Simulatormod” folder. In American Truck Simulator it’s easy to install mods. Frequently Asked Questions How do you get mods for american truck simulator?