The Polish home-made car trailer you have described sounds like a versatile and useful addition to FS25 for transporting various types of cargo. With its wooden sides and configurable colors for the frame, boards, and rims, it seems like a customizable and aesthetically pleasing trailer.
The functionality of the working lighting and the Interactive Controls for opening the tailgate in the unfilled configuration add to the realism and usability of the trailer in the game.
At a price of $1,800, a weight of 630 kg, and a capacity of 1200 l, the trailer offers a good balance between cost, capacity, and weight capacity for transporting bulk materials, bags, pallets, and bales in the game.
The requirement of the Interactive Control mod adds an extra layer of interactivity and control, enhancing the overall gameplay experience when using the trailer.
Overall, this trailer seems like a well-rounded and practical asset to have in FS25 for handling a variety of transportation tasks efficiently.