On the basis of a category D driver's license, you can drive a road train, provided that the power-driven vehicle for which the category D driver's license entitles you, attach:
Trailed vehicle with a maximum permissible mass not exceeding 750 kg .
Trailed vehicle with a maximum permissible mass not exceeding 1,000 kg .
Trailed vehicle with a maximum permissible mass not exceeding 1,250 kg .