The picture below shows the baseline model of the Dodge Ram pickup. All models were tested with the side mirrors removed. Notice that separation (flow becomes unattached from the surface) occurs behind the cab and tailgate, while flow is trapped ahead in the bed cavity. Flow along the side enters the bed cavity. The baseline condition has a drag coefficient of 0.432 with the side mirrors removed.
The Chrysler Corporation specification for drag coefficient for this model with the mirrors in place is 0.470