R.I. Gen. Laws § 31-23-14.1: Fire extinguishers.

Every truck operated, owned, or leased by the state of Rhode Island or a political subdivision of the state shall be equipped with a fire extinguisher. The fire extinguisher shall contain a potassium bicarbonate base dry chemical fire extinguishing agent having an underwriter’s laboratory rating of six (6) B:C, and a capacity of not less than two and one-half pounds (21/2 lbs.).