Md. Code, Transportation § 11–144.1

“Park model recreational vehicle” means a vehicle that:

(1) Is designed and marketed as temporary living quarters for recreational, camping, travel, or seasonal use;

(2) Is not permanently affixed to real property for use as a permanent dwelling;

(3) May require a special permit for highway use;

(4) Is built on a single chassis mounted on wheels;

(5) Has a gross trailer area not exceeding 400 square feet in the setup mode; and

(6) Is certified by the manufacturer as complying with the American National Standards Institute A119.5 standard for recreational park trailers.