You can drive vehicles with:
no more than 16 passenger seats
a maximum length not more than 8 metres
a trailer up to 750kg
You can drive D1 category vehicles with a trailer over 750kg, but the trailer - when fully loaded - can’t weigh more than the vehicle.
The combined weight of both can’t exceed 12,000kg.
You can drive any bus with more than 8 passenger seats (with a trailer up to 750kg).
You can drive D category vehicles with a trailer over 750kg.