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Flexible Mod Management

In American Truck Simulator (ATS), standard mods typically require perfect synchronization between the server and every client. However, you can configure your server to allow certain modifications to be “Optional.” This flexibility enables players who do not have specific cosmetic or utility mods to still join and enjoy the convoy without receiving a version mismatch error.

Difficulty

Intermediate

Time

5 Minutes

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Configuration Settings

To enable optional mod support, you must modify your server primary configuration file.
1

Access the File Manager

Log in to your Game Panel and navigate to the Files tab in the sidebar.
2

Edit server_config.sii

Locate the server_config.sii file in your configuration directory and open it with the integrated editor.
3

Enable Optional Client Mods

Find the property mods_optional_for_client and change its value to true.
mods_optional_for_client: true
4

Save and Restart

Commit your changes and Restart your server via the Console tab to apply the updated rules.

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Strategic Trade-offs & Limitations

While optional mods significantly increase accessibility, they introduce technical trade-offs that administrators should manage carefully.
If a client joins without a specific vehicle mod that the server is using, that truck may appear as a generic red “ERROR” placeholder or be entirely invisible to them. This can impact the immersion of roleplay-heavy communities.

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Which Mods Should Be Optional?

We recommend only setting sound mods, UI enhancements, or interior accessories as optional. These are primarily client-side assets and rarely interfere with the synchronized positions or safety of other drivers in the convoy.

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Need Extra Help?

If you encounter any issues, our support team is ready to assist:

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Last Updated: January 2026 | Mods: Freedom and stability.