Name can be anything, but make sure that similar vehicles with different drive characteristics are clearly identified to prevent incorrect use. Click the button next to the Name field to enter Source, Description, and Notes.
Notes on Unit Type:
Trailers have no steering parameters, and can have front and rear or just rear axle groups. Setting Tractor Used as Trailer forces Autodesk Vehicle Tracking to ignore the steering criteria for this unit and treat the remaining data as if it were a trailer.
As you edit the Type the tabs change to show only the ones that are relevant for the type.
Vehicle Category and Classification are merely sort criteria used in the Vehicle Library Explorer and have no bearing to how the unit behaves.
The Datum is the reference point for all dimensions on the unit. It can be set to the farthest front or rear point on the body, the front or rear primary axle, or the front or rear coupling. The distance from the datum to the Innermost Front Axle and Innermost Rear Axle must be specified. Obviously if the selected datum is one or other of these values, then the appropriate dimension will be zero. The values are directional as indicated by the text that follows the field and the direction in which the unit is facing. You will not be able to edit the front axle offset if you have a drawbar front axle and a front coupling datum.
Both front and rear axle groups are made equivalent to single effective axles. The position of these effective axles is dependent upon a number of factors including the axle and steering geometry and the tyre dimensions. It is the effective axle positions that determine how the vehicle moves. By default Vehicle Tracking calculates the positions of the effective axles for you, but in some cases it is useful to specify the position manually.
If you wish to set the Effective Front Axle Offset or Effective Rear Axle Offset manually then clear the relevant Use Calculated Value box and enter the offset using the same direction convention as the Innermost Front Axle.