This subchapter does not apply to:
(1) farm equipment used for a purpose other than construction;
(2) special mobile equipment owned by a dealer or distributor;
(3) a vehicle used to propel special mobile equipment that is registered as a farm vehicle under Section 502.433; or
(4) equipment while being used by a commercial hauler to transport special mobile equipment under hire of a person who derives $500 in gross receipts annually from a farming or ranching enterprise.