Truck for motorsport.

Hello I work in a building material transport and drive the week over a 3 year old 40 tons crane train. since I deal with motorsport in my spare time and also drive I would have asked a few questions! In the next time there are again several races and would like to use the truck for transport of our four cars which I drive the week over? because I have to keep my weekly rest times I would like to know if I can make the journey back and forth without my driver card because that is not a commercial transport? And if I can drive back with the train on Sundays again, if I would get an exception for it? As I said, everything is hobby and, after my opinion, does not go into commercial goods traffic! My cheff would not have tried to use the truck until now, he only said I should make myself clever before that because of the pre-selected to private rides! Hope you can help me MFG Lutzifa 🙂