Electrical energy generating device for a wheeled semi-trailer

A land vehicle in the form of a wheeled semi-trailer, said land vehicle being adapted for attachment to and movement by a tractor vehicle, said wheeled semi-trailer comprising:

• a vehicle body having wheels provided thereon;
• an energy consuming device provided on said vehicle body, said energy consuming device being a consumer of electrical energy;
• engagement means for engaging said vehicle body to the tractor vehicle;
• electrical energy providing means for providing electrical energy to the energy consuming device, said electrical energy providing means being mounted on said vehicle body;
• and
• mechanical energy supply means for supplying mechanical energy for powering said electrical energy providing means;
• wherein said mechanical energy supply means comprises at least one of:
• a compressed air supply;
• and
• flexible drive shaft means for driving said electrical energy providing means, said flexible driven shaft means being driven by at least one of said wheels of said wheeled vehicle body.