Many expedition have fixed combinations of truck+trailer+driver.
When you plan a trip for a certain truck it is easy that this trailer and driver are also filled in when you choose this truck.
1. Open the vehicle screen
2. Select Truck as vehicle type (Trækker in the example, which is Danish)
3. Select the truck and open the tab sheet Linked resources
4. Fill in a date from (date till is not mandatory) en use the space bar to open the popup screen which contains the resources.
5. Fill in 'first' for Index. A completely filled in coupling will look like this: