Returns the number of trips for a given company or group grouped by vehicle models.

This endpoint returns the number of trips performed by all the trackers of the given company or group, grouped by vehicle models.
The call must include either the company_oid or the group_oid as your identifier.
Optionally, the call can include the following parameters:

• start_date and end_date. These parameters specify the time period of interest, i.e. only trips that fall in between these dates will be listed.
  If the end_date is omitted, the list will include all the trips from the start_date until now.
  If both dates are omitted, the list will include the trips of the last seven days.