Interpretation ID: nht94-3.68

TYPE: INTERPRETATION-NHTSA

DATE: July 14, 1994

FROM: John Womack -- Acting Chief Counsel, NHTSA

TO: James H. Shuff -- President, Freedom Trailers

TITLE: NONE

ATTACHMT: Attached to letter dated 2/9/94 from James H. Shuff to NHTSA Chief Counsel (OCC-9666)

TEXT: This responds to your letter asking whether tires and wheel rims used with your "park model travel trailers" are subject to Federal Motor Vehicle Safety Standard (FMVSS) No. 120, Tire selection and rims for motor vehicles other than passenger cars. As ex plained below, the answer is no, because your travel trailers are not motor vehicles.

Your letter provided the following information about your "trailers." The trailers are intended for recreational use, rather than for year round living. Each unit is a maximum of 400 sq. ft., and may be as wide as 12 feet. You state that after your trai lers are constructed, they "will be towed to their campsite and set up," where they may be used for "winter camping in the year round parks." Once your trailers are set up, you would reuse the tires and rims.

By way of background, 49 U.S.C. @ 30101 et seq. authorizes NHTSA to regulate new motor vehicles and motor vehicle equipment, including tires and rims. Standard No. 120, and all of our safety standards, apply only to vehicles that are "motor vehicles," w ithin the meaning of the statute. The term "motor vehicle" is defined at 49 U.S.C. @ 30102(a)(6) as:

"motor, vehicle" means a vehicle driven or drawn by mechanical power and manufactured primarily for use on public streets, roads, and highways, but does not include a vehicle operated only on a rail line.

We have determined that your "trailers" are not motor vehicles based on two examinations. First, while the characteristics of your trailers are not entirely clear in your letter (our repeated attempts to reach you by telephone have been unsuccessful), i t appears that your trailers could be considered "mobile homes." Mobile homes are regulated by the U.S. Department of Housing and Urban Development (HUD), and

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are not "motor vehicles" subject to regulation by NHTSA. Accordingly, tire and rim selection for mobile homes is not subject to Standard No. 120 or any other NHTSA regulation. For information about mobile homes, you can contact the Assistant Secretary for Housing-Federal Housing Commissioner, U.S. Department of Housing and Urban Development, 451 7th St., SW, Washington, DC 20410.

Second, even if your "trailer" is not a mobile home, it does not meet the Safety Act definition of a "motor vehicle." We have interpreted the definition as follows. Vehicles designed and sold solely for off-road use are not considered motor vehicles, ev en though they may be operationally capable of highway travel. Vehicles, such as mobile construction equipment, that use the public roads only to travel between job sites and which typically spend extended periods of time at a single job site, are not c onsidered motor vehicles. In such cases, the use of the public roads is incidental, not the primary purpose for which the vehicle was manufactured.

On the other hand, if a vehicle is readily usable on the public roads and is in fact used on the public roads by a substantial number of owners, NHTSA has found the vehicle to be a motor vehicle. This finding was made with respect to dune buggies and re gardless of the manufacturer's stated intent regarding the terrain on which the vehicles were to be operated.

Based on your description, it appears that, analogous to mobile construction equipment, the on-road use of your travel trailers appears to be incidental and not the primary purpose for which they are manufactured. Therefore, your trailers are not subjec t to Standard No. 120's requirements for tire selection and rims. Please note that this conclusion is based solely on the facts presented in your letter. We may reexamine this conclusion if additional information becomes available that would warrant a reexamination.

I hope that this information is helpful. If you have any questions, please contact Dorothy Nakama of my staff at this address or at (202) 366-2992.