This mod works on versions 1.36 – 1.41 and unfortunately it’s still free roam the contents of this trailer have 16 lowbed tires and 8 lowbed dolly tires and some trailer loads
Contents of the trailer for lowbed dolly 8 tires:
1. excavator bucket
2. condenser
3. excavators
Contents of the lowbed trailer 16 tires:
1. excavator bucket
2. excavator
3. wheel loaders

Credits:
Hilman Alwi