Extract the file to get the Base and Def mods.
Special Transport Pick-Up Truck Skinable for American Truck Simulator
Change.log V2:
Only works with Special Transport DLC which is required
https://steamcommunity.com/sharedfiles/filedetails/?id=1687265762
Discord - https://discord.gg/VKptGDdS3n
Website - https://www.gmc-logistics.co.uk/