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