Which product are you asking about - Trimble Access or SCS900 or Siteworks?
SCS900 and Siteworks both support Station Equations. If you are asking about Trimble Access, I apologize but I cannot answer that (I don't work with Access these days) and you should post that question on the Geospatial Forum.
SCS900 and Siteworks have a Roading Module and that would be required to use the Road Model and Station Equations.