That sounds like a fantastic idea for a liquid trailer mod for FS25! Having a capacity of 30,000 liters for any liquid would make it versatile for various applications in the game. Realistic trailer suspension that adjusts based on whether the trailer is empty or fully loaded would enhance the immersion and realism of the gameplay experience. Additionally, offering expanded rim color choices would allow players to customize the trailer to their preferences, making it visually appealing and personalized. These features combined would certainly make for a popular and practical trailer mod for FS25.