The commission shall appoint a shipper advisory committee of five members appointed from shippers at large to advise the commission on the exercise of its powers and duties under this chapter. Each member shall be an individual shipper, or a partner or employee of a shipper, who is actively engaged in shipping fresh grapes in this state for a period of at least five years. A member of the shipper advisory committee shall maintain these qualifications during their appointment to the committee in order to remain on the committee.