The Chief of Police shall contract with independent wreckers and award contracts for a one-year period. The independent wreckers shall furnish supplementary emergency wrecker services and these services shall be performed on a twenty-four (24)-hour basis in lieu of the regular city wreckers. The wrecker's qualifications shall be determined by the Chief of Police. The wreckers shall be equipped to perform the services with efficiency to conform with the charges set forth by §§ 72.22(A) (2) and 72.23(A) and (B). The contractor is to protect the city by furnishing insurance fully covered as to public liability, property damage, cargo, workman's compensation, and any other insurance necessary in the performance of its duties.