I'll show you a quick, easy and simple way to setup a dual monitor system for both American Truck Simulator and Euro Truck simulator 2.

This is how I have my setup and it works flawlessly on my two 27" 1080p monitors I can't guarantee it will work on other sizes of monitors (I can't see why not) however as long as you follow my instructions in this video and create backups of the files you edit you can simply revert back to the originals if anything goes wrong. Remember BACKUP BACKUP and you guessed it BACKUP whenever you are editing any files.

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For AMD EYEFINITY or Nividia Surround you can either follow what I explain in the easy click and forget instructions in my video or for a more in depth explanation use the links bellow.

AMD EYEFINITY Guide: https://www.amd.com/en/support/kb/faq...

Nividia Surround Guide: https://www.nvidia.com/content/Contro...
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Files you need to edit are located where your main game files are, this by default is in Documents under either "American Truck Simulator" and/or "Euro Truck Simulator 2"

The files you will be editing are:

config.cfg
Locate - uset r_multimon_mode "0" and change it to uset r_multimon_mode "4"

Next
multimon_config.sii
If this file does not exist, just create a file and name it the same, and then follow the instructions below:
Copy and paste everything below between the ========= Lines
DO NOT COPY the ========= Lines just what is between them.

========================
*SiiNunit
{
multimon_config : _nameless.04A6.56A8 {
normalized_ui_x: 0.0000
normalized_ui_width: 0.5000
monitors: 2
monitors[0]: _nameless.0714.5590
monitors[1]: _nameless.0714.5618
}

monitor_config : _nameless.0714.5590 {
name: center
normalized_x: 0.000000
normalized_y: 0.000000
normalized_width: 0.500000
normalized_height: 1.000000
horizontal_fov_relative_offset: 0.000000
vertical_fov_relative_offset: 0.000000
heading_offset: 0.000000
pitch_offset: 0.000000
roll_offset: 0.000000
camera_space_offset: (0.000000, 0.000000, 0.000000)
horizontal_fov_override: 90.000000
vertical_fov_override: 0.000000
frustum_subrect_x: 0.000000
frustum_subrect_y: 0.000000
frustum_subrect_width: 1.000000
frustum_subrect_height: 1.000000
render_interior: true
render_exterior: true
}

monitor_config : _nameless.0714.5618 {
name: right
normalized_x: 0.500000
normalized_y: 0.000000
normalized_width: 0.500000
normalized_height: 1.000000
horizontal_fov_relative_offset: 0.000000
vertical_fov_relative_offset: 0.000000
heading_offset: -90.000000
pitch_offset: 0.000000
roll_offset: 0.000000
camera_space_offset: (0.000000, 0.000000, 0.000000)
horizontal_fov_override: 90.000000
vertical_fov_override: 0.000000
frustum_subrect_x: 0.000000
frustum_subrect_y: 0.000000
frustum_subrect_width: 1.000000
frustum_subrect_height: 1.000000
render_interior: true
render_exterior: true
}

}