Yes - the “Resource Kit Manager” panel in Dynamite VSP allows the content of the object libraries to be edited and added to. Open that panel and navigate to the vehicles category, then make a copy of one of the object definition files in the list.
Now you can specify the source object for the new definition file. When you select the button to change the source max file, you’ll notice that from the file navigation panel you can also select RPC files.
Assuming you have the RPC plugin installed, this will allow you to use the Object Placement Style Editor to place RPC content into your model.