there is no direct way to realize that.
The force working on the object can be routed to the force input of a rigid body tag of Dynamics. This way, the object reacts within the Dynamics simulation. A sample project file can be downloaded from the c4dplugin.com download page. Be sure to update your CRASHBOX plugin, since there was a bug in the data output.
As an alternative, you may put a rigid body object into the car body working as a Dynamics collision object. This would certainly not slow down the car, so it would be suitable for very light objects only.