The term of office for each commissioner is two years, however, at least three of the commissioners initially appointed shall have terms of one year. Thereafter all commissioners appointed shall serve for two years. Each commissioner shall hold office until his successor has been appointed and qualified. Vacancies for the unexpired terms of any commissioner who resigns, ceases to be qualified or is removed must be promptly filled by the governing body. Any commissioner is removable by the governing body of the municipality at will. A commissioner shall receive such compensation, if any, as the governing body may provide for this service, and is entitled within the budget appropriation to the necessary expenses, including travel expenses, incurred in the discharge of his duties.