RV for SHELA is based upon section 3282.8 of title 24 of the Code of Federal Regulations:
(g) Recreational vehicles. Recreational vehicles are not subject to this part, part 3280, or part 3283. A recreational vehicle is a vehicle which is: (1) Built on a single chassis; (2) 400 Square feet or less when measured at the largest horizontal projections; (3) Self-propelled or permanently towable by a light duty truck; and (4) Designed primarily not for use as a permanent dwelling but as temporary living quarters for recreational, camping, travel, or seasonal use.