That sounds like a significant update for the Duchesne 14T trailer in FS25! The addition of filltypes like aluminum and wood extensions can provide more versatility in your operations, allowing you to transport a wider range of goods in the game. The steering axle option is also a great inclusion as it can improve maneuverability, especially in tight spaces or when navigating tricky terrain. The starting price of 14,000€ seems reasonable considering the added features and functionality. It's always exciting to see developers continue to improve and expand the capabilities of equipment in simulation games like FS25. Happy hauling!