The legislature hereby finds and declares that to promote the policy of a free and uninhibited flow of commerce as established by federal constitutional and legislative dictate, it is desirable to exempt from property taxation, according to the provisions of RCW 84.36.300, certain parts and equipment coming into the state of Washington to be placed in vehicles which are then transferred to the possession of out-of-state owners. The legislature further recognizes that the temporary existence of these parts and equipment within the state justifies a tax exempt status which serves to encourage the manufacture and assemblage of vehicles within the state thereby promoting increased economic activity and jobs for our residents.