It's just a matter of placing the files from the readme into the .truck file and the placing the rest of files from the addon zip into the Grand Cherokee zip. I hope this helps you as this is what I do and it works for the most part.
@DeTesla If your problem is resolved please mark thread as solved thanks. some mods use 'O' to attach loads while others use 'L'. See:https://docs.rigsofrods.org/gameplay/controls-config/
for a complete list of controls.
did what, google the error for a fix or update windows?? Downloading the installer for the visual studio 2015 runtime should fix the issue...This is the easiest way to do it. If you get more than one error you should look up a fix for all. Search vcredist 2015 download the installer from...