I wouldn't think that the movement or vibration should be a problem if the PC is well padded. I assume that you will be travelling on the continent. If so, the electricity supply would need serious consideration. It can vary enormously in voltage and reliability. Some sort of surge protection is esential. I don't know whether reverse-polarity would cause a problem, but this is widespread on continental sites.
You would need to be careful about dust, heat and humidity. Obviously, if you have air-conditioning this should not be a problem. Security would be another consideration.