Forest River and most manufacturers, don't provide such things with the RV.
most only provide a generic owner's manual that covers basic systems and are not specific to any type of RV.
you do get manuals/specs/diagrams with some things that are from other companies. things like the a/c, furnace, converter, water heater, fridge/freezer and so on.
these are usually available on the particular company's website, such as Dometic or Norcold.