Heavy hauler trailer.

Heavy hauler trailer. A trailer which has one or more of the following characteristics, but which is not a container chassis trailer:
(1) Its brake lines are designed to adapt to separation or extension of the vehicle frame; or
(2) Its body consists only of a platform whose primary cargo-carrying surface is not more than 1,016 mm (40 inches) above the ground in an unloaded condition, except that it may include sides that are designed to be easily removable and a permanent “front-end structure” as that term is used in § 393.106 of this title.

Source

49 CFR § 393.5

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Scoping language

As used in this part, the following words and terms are construed to mean:

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