Okla. Stat. tit. 47, § 47-12-405.2: Fuel tanks and intake pipes - Projection beyond side

of vehicle - Construction and attachment.

A. No fuel tank or intake pipe on any motor vehicle shall

project beyond the side of the motor vehicle. In no case shall the

fuel tank or fuel intake pipe on any bus be located within or above

the passenger-carrying portion of the bus.

B. Any fuel tank carried upon a motor vehicle, including any

auxiliary tank, shall be of substantial construction, permanently

and securely attached to the motor vehicle.