Section 301.271 - Reciprocity in registration with other states - registration of trailers1. Unless otherwise provided by duly executed agreements entered into pursuant to sections 301.271 to 301.279, a nonresident owner, owning any motor vehicle which has been duly registered for the current year in the state, District of Columbia, territory or possession of the United States, foreign country or other place of which the owner is a resident, and which at all times when operated in this state has displayed upon it the number plate issued for the vehicle in the place of residence of such owner, may operate or permit the operation of such vehicle within this state without registering such vehicle or paying any such registration fee to this state; but the provisions of this subsection shall be operative to allow such owner to operate or permit the operation of such vehicle owned by a nonresident of this state only to the extent that under the laws of the state, District of Columbia, territory or possession of the United States, foreign country or other place of residence of the nonresident owner, substantially equivalent exemptions are granted to residents of Missouri for the operation of vehicles duly registered in Missouri.2. Unless otherwise provided by duly executed agreements entered into pursuant to sections 301.271 to 301.279, trailers registered in any jurisdiction may be operated in combination with any motor vehicle properly registered in accordance with sections 301.271 to 301.279.L. 1958 2d Ex. Sess. p. 176 §§ 6, 7