Sided vehicle.
Sided vehicle. A vehicle whose cargo compartment is enclosed on all four sides by walls of sufficient strength to contain articles of cargo, where the walls may include latched openings for loading and unloading, and includes vans, dump bodies, and a sided intermodal container carried by a vehicle.
Source
49 CFR § 393.5
Scoping language
As used in this part, the following words and terms are construed to mean: