Haw. Rev. Stat. § 271-30: Allowance to shippers for transportation services.

If the shipper of property transported under this chapter, directly or indirectly, renders any service connected with the transportation, or furnishes any instrumentality used therein, the charge and allowance therefor shall be published in tariffs or schedules filed in the manner provided in this chapter and shall be no more than is just and reasonable; and the public utilities commission may, after hearing on a complaint or on its own initiative, determine what is a reasonable charge as the maximum to be paid by the carrier or carriers for the services so rendered or for the use of the instrumentality so furnished, and fix the same by appropriate order.