The body shall provide coverage of the two dual rear wheels and tires or be equipped with suitable protectors of metal or substantial flexible extensions. When extensions are provided, they shall meet the requirements of COMAR 11.14.04.10. The wheel housing opening shall allow for easy tire removal and service. Rear wheel housing shall be shielded with a metal splash guard on the front and rear of rear wheel wells. The wheel housings shall: Provide clearance for installation and use of tire chains on dual wheels; Be designed to support the seat and passenger loads; and Be attached to the floor sheets in such a manner as to prevent any dust, water, or fumes from entering the body. The inside height of the wheel housing above the floor line may not exceed 12 inches.