Find the truck mod’s folder in your ATS `mod` directory
Open the truck mod and locate the `vehicle` or `truck` folder
Identify the texture files, usually `.dds`
Copy the original texture files to a safe backup folder
Open the texture in an image editor that supports DDS files
Edit the texture and place your design on the UV layout
Save the edited file as `.dds` using the correct compression
Create a new mod folder for your skin
Add the edited texture file into the correct path inside your new mod
Create or edit the `manifest.sii` file for the skin mod
Create a `def` folder if the skin needs custom definitions
Add paint job or accessory definition files as required by the truck mod
Match the truck’s internal name and accessory names exactly
Set the correct material and texture references in the definition files
Pack the mod folder into a `.zip` file if needed
Place the skin mod in the ATS `mod` folder
Enable the mod in the ATS Mod Manager
Load the truck in-game and check the skin
Fix texture alignment, missing parts, or wrong material paths if needed
Repack and retest until the skin displays correctly