1. Of the first commissioners appointed, one shall hold office for 1 year, two for 2 years, three for 3 years, and three for 4 years. Thereafter all commissioners shall be appointed for terms of 4 years.
2. Commissioners shall hold office until their successors are appointed and qualified.
3. Any vacancy in the office of commissioner shall be filled for the unexpired term in the same manner as original appointments.
4. Commissioners shall serve without compensation but shall be entitled to the same travel expenses and subsistence allowances as county officers.