137.080.  Annual assessment date — subclasses of tangible personal property. — Real estate and tangible personal property shall be assessed annually at the assessment which commences on the first day of January.  For purposes of assessing and taxing tangible personal property, all tangible personal property shall be divided into the following subclasses:

  (1)  Grain and other agricultural crops in an unmanufactured condition;

  (2)  Livestock;

  (3)  Farm machinery;

  (4)  Vehicles, including recreational vehicles, but not including manufactured homes, as defined in section 700.010, which are actually used as dwelling units;

  (5)  Manufactured homes, as defined in section 700.010, which are actually used as dwelling units;

  (6)  Motor vehicles which are eligible for registration and are registered as historic motor vehicles under section 301.131;

  (7)  All taxable tangible personal property not included in subclass (1), subclass (2), subclass (3), subclass (4), subclass (5), or subclass (6).