Interpretation ID: 77-5.17

TYPE: INTERPRETATION-NHTSA

DATE: 12/29/77

FROM: AUTHOR UNAVAILABLE; J. J. Levin, Jr.; NHTSA

TO: Utility Trailer Manufacturing Co.

TITLE: FMVSS INTERPRETATION

TEXT: This responds to Utility Trailer Manufacturing Company's October 6, 1977, request for confirmation that the criteria for a bulk agricultural commodity trailer contained in S5.6 and S5.8 of Standard No. 121, Air Brake Systems, can be met by a trailer that does not accommodate "slip-in bottom dump" bulk harvest tubs as well as the "deck type" harvest tubs used for tomatoe harvesting. From your description, it is assumed for the purposes of this interpretation that the trailers in question do conform to the criteria in the standard for maximum length and an air line and reservoir arrangement that minimize field damage.

The criterion of "skeletal construction that accommodates harvest containers" can be met by a design that accommodates mounting of deck type bulk harvest tubs by means of removable flooring, whether or not the removal of flooring also permits the mounting of "slip-in bottom" bulk harvest tubs.

SINCERELY,

UTILITY TRAILER MANUFACTURING CO.

October 6, 1977

National Highway Safety Administration

Attention: Duane Perrin

Attached is a copy of a letter sent to our Utility Dealers who have historically sold the agricultural commodity trailer. The letter tells the story.

Basically, we find that there are many more trailers required in the tomatoe harvest than any other kind. Thus, the operator wants to avoid the cost of accommodating the slip-in containers which adds plenty to the cost and weight of the trailer - - - and, I find that our competitors are following the rules we have now set. A copy of a letter that stated our position to Fruehauf last May is attached. Obviously, we and Fruehauf now have the same rules.

Unless we are off-base, I will assume that you agree with our restrictions.

Paul Bennett Chief Engineer

ATTACH.

To: San Leandro - Bruce Myers Fresno - Lyman Ehrlich Los Angeles - James Pollard Phoenix - Ben Cravens The legal definition of an Agricultural Commodity Trailer with specific exemptions from MVSS 121 is "Trailer designed with a high ground clearance and other special features for use with farm tractors during harvest."

Up to the date of this letter Utility has restricted its manufacture of Agricultural Commodity Trailers to a specially designes combination trailer model FS1WC (Semi) and FF2WC (Pull). We now learn many users do not want or need extra expense of a combination trailer that will accommodate a deck mounted harvest tub (tomatoes) as well as the bottom dump can for slip-in body (grapes and fruit) - - - and, that often, a center frame design is preferred to the wide frame design. As a consequence, the following trailer type order will be accepted for trailers qualified as Agricultural Commodity Trailers:

1. Standard Utility combo trailer Models FS1WC & FF2WC, - or -

2. Utility chassis trailer Models FS1W and FF2W (wide frame) or FS1C and FF2C center frame trailers which consider the following special specification:

A. Booster mountings to be top mounted on the axles to accommodate the high road bed clearance requirement.

B. Omission of all floor material for the purpose of accommodating a customer light weight floor or base support for a deck type harvest tub.

C. Trailer lengths may not exceed 27 ft.

D. A dealer letter is to accompany each order warranting that a sole and primary use will be in-field with farm type tractor. The dealer, obviously, should protect himself with a similar letter at time of sale.

John C. Bennett

CC: NHTSA