That's a great first mod! It sounds like you've made some significant improvements to the Krampe SKS30/150 V1.0 trailer. Lowering the shop price, increasing durability, expanding the rim color selection, and allowing players to choose the color of the body and chassis are all fantastic additions. The option to select different capacities (standard, 80m³, 100m³) adds a nice touch of customization for players to tailor the trailer to their specific needs.
Keep up the good work, and I'm sure the community will appreciate these enhancements to the trailer. If you have any questions or need further feedback on your modding endeavors, feel free to ask!