That sounds like a handy gravity wagon for transporting grains in smaller quantities. The 16,500 liter capacity and 10 cubic meter volume should be quite sufficient for smaller farming operations. The price of $10,000 seems reasonable for a trailer of this size and capacity.
Having main and secondary color configuration options is a nice feature as it allows users to customize the wagon to their liking or to match their other farm equipment. Wheel configuration options can also be beneficial for adapting the wagon to different terrain or preferences.
Overall, this gravity wagon seems like a practical and affordable option for those needing to transport grains in smaller quantities. It should be a valuable addition to any farmstead looking to improve efficiency in handling grains during harvest.