I am editing the exterior dimensions of a vehicle from the EDVDB vehicle database and I do not see the geometry file scaling to match the new positions of the red spheres indicating the exterior dimensions of the vehicle. Why?

The exterior geometry of a vehicle from the EDVDB database is an exact 3D model of an actual vehicle made by physically recording the vehicle using a digitizer. This geometry is not resizable and cannot be edited within the Vehicle Editor, except for changing the color of the vehicle. When you edit the exterior dimensions of the vehicle by clicking on the red spheres and changing the values, you are changing the values of the dataset for the vehicle, but you are not editing the geometry mesh. If you edit the exterior dimensions of a Generic vehicle, you will see that the generic geometry does scale to match your new dimensions. This is because the generic vehicle body is drawn by HVE.