Following the annual township meeting under section 58-04-01 and the consolidation election, a multitownship meeting must be held and the qualified electors shall elect a multitownship board of supervisors. If the number of consolidated townships is five or fewer, the multitownship board of supervisors must consist of one supervisor elected from each township. If the number of consolidated townships is two or four, an additional township supervisor must be elected at large so the multitownship board consists of three or five members. The length of the terms of the supervisors first elected must be staggered so that the terms of an equal amount of supervisors, or as nearly as practicable, expire each year. In addition, the qualified electors shall elect a multitownship clerk and a multitownship treasurer. The multitownship officers elected at the annual meeting shall assume all the powers and duties of the township officers of the townships approving the consolidation.