An agreement or arrangement entered into, or a declaration issued under the authority of chapter 46.87 RCW or this chapter may contain provisions authorizing the registration or licensing in another jurisdiction of vehicles located in or operated from a base in such other jurisdiction which vehicles otherwise would be required to be registered or licensed in this state; and in such event the exemptions, benefits, and privileges extended by such agreement, arrangement, or declaration shall apply to such vehicles, when properly licensed or registered in such base jurisdiction.
RCW 46.85.050