Hello to this honourable forum, despite eager torment of the search function I am unsure, therefore the question: I would like to purchase a used Sprinter 313 CDi box van for own commercial purposes (house management). I also have a good offer, the car has an zGG of 3,500 kg, a trailer coupling and therefore an EC-tachograph (for 1 day / 2 drivers, original MB equipment) inside. This harmless looking box worries me now: 1) I have to hold a driver card for this thing? 2) Does the tachograph always have to be used or only if I drive every jubilee with a (borrowed) trailer? Because 99.8% of the car is moved solo. For enlightenment I thank and wish everyone here a good turn into a healthy 2009!