“I downloaded the AGG 300 from bfdcml. The middle carriage floated 2 meters above the ground. Never again.”

Your keyword is chasing a unicorn. The “best” free one doesn’t exist in a stable, feature-complete form. The “bfdcml” tag is a red flag.

Master the Streets: Exploring the OMSI 2 AGG 300 Bi-Articulated Bus

User consensus for this add-on is currently on Steam.

The Doppelgelenkbus AGG 300 add-on offers several notable features, including:

: Comes with high-resolution default repaints and templates for creating custom liveries. Performance and Community Feedback