For those looking to modify .scs files, checking the SCS Software Modding Wiki is the best way to understand how to implement new chassis or cargo definitions for version 1.46. Add-On Pavelli STV Strong [1.57/1.58] - Adver - Gumroad

Developing additional accessories like custom mudflaps, toolboxes, or side protection skirts that match the Pavelli's rugged aesthetic.

If you are looking to develop or add a new feature to this specific version, you might consider these common community requests for trailer mods:

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Create at the speed of thought.