The registrar of motor vehicles shall administer sections 168.841 to 168.846 and may promulgate such rules pursuant to chapter 14 as may be required, including forms for the submission of required data as to rental trucks or rental trailers owned, miles traveled within and without the state, average number of rental trailers operated in and through the state and such other information as may be required for the enforcement of sections 168.841 to 168.846. The registrar may establish dates for the submission of required forms and reports and may, for good cause shown, waive any deadline established.