Interpretation ID: nht76-3.49

DATE: 03/15/76

FROM: AUTHOR UNAVAILABLE; F. Berndt; NHTSA

TO: Bock Products, Inc.

TITLE: FMVSS INTERPRETATION

TEXT: This responds to your February 11, 1976, question whether two trailer designs you describe would qualify as "Heavy Hauler Trailer[s]" as defined in Standard No. 121, Air Brake Systems. A copy of that definition is enclosed for your information.

Both of your trailer designs include a primary cargo-carrying surface that inclines from a height of 24 inches in the rear to a height of 47 inches in the front of the trailer. In one case, part of the inclined portion is removable, leaving a 6-foot length of the surface that is flat and 40 inches above the ground in the unloaded condition. In both cases somewhat more than one-half of the primary cargo-carrying surface is 40 inches or less in height.

The exclusion from Standard No. 121 for heavy hauler trailers applies (in relevant part) only to trailers "whose primary cargo-carrying surface is not more than 40 inches above the ground in an unloaded condition." The trailer designs you describe would not qualify for the exclusion, because only a portion of the surface qualifies as "not more than 40 inches above the ground."

SINCERELY,

BOCK PRODUCTS, INC.

Feb. 11, 1976

Office of the Chief Council NHTSA

Att: M.J. Herlihy

Mr. Sydney Williams of NHTSA suggested we write for a ruling on the enclosed designs to see if they would be exempt from the FMVSS #121.

They appear to fall within the description of the "Heavy Hauler Trailer", in that the bed height is below 40" over the primary cargo carrying length of the trailer.

However, to be sure of our position we are in need of a ruling by your office.

These designs would be used in the recreational vehicle industry as transporters for manufacturers of travel trailers and mini-motor homes.

Design #2 describes a 6'-0" section of removable ramp which would be left in position when transporting their product. It would install by pins at both ends.

We require your immediate attention on this matter as a rush order is pending.

Robert Fisher Sales Engineer/Coordinator

PROPOSED DESIGN PROFILE #2

DATE: 2-10-76

BOCK PRODUCTS 1901 W.HIVELY AVE. ELKHART, IND. 46514

NOTE! GROUND HEIGHT DIMENSIONS SHOWN ARE UNLOADED HEIGHTS

(Graphics omitted)

PROPOSED DESIGN PROFILE #1

DATE: 2-10-76

BOCK PRODUCTS

1901 W. HIVELY AVE. ELKHART, IND. 46514

NOTE! GROUND HEIGHT DIMENSIONS SHOWN ARE UNLOADED HEIGHT

(Graphics omitted)