oberhausener68 thanks for the feed-back. I had a quick look and it seems you've only removed the ability for the trucks to transport Construction materials and Plastic(? please confirm).
The stdout is complaining about the cargo slots and there I see the settings on your Wertz truck deviate from the original. It looks like you've copied the settings from the FES truck. However the Custom Cargo models aren't identical on all trucks, so that's why it crashes (the referenced cargo models aren't found in the mdl).
For your goal you can better remove the unwanted cargo types from each model individually instead of copying them from one model to the others.