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Roll up doors are sometimes used in place of swing doors on trailers that make shorter haul deliveries. Diagram of a refrigerator door from 1912 Swing doors are most commonly used on tractor-trailers (dry vans and refrigerated "reefer" vans), intermodal cargo shipping containers , certain rail cars that carry automobiles, and smaller utility ...
Like other semi-trailers, most commercial car carrier trailers attach to the tractor using a fifth wheel coupling. Trailers can either be enclosed, possessing walls like a conventional box trailer, which affords the shipped vehicles more protection at the cost of lower capacity; or open, as in the commonly seen skeletal tube steel design, which ...
Truck or vehicle restraint system – a strong metal hook mounted to the base of the dock which will hook to the frame or bumper of a trailer and prevents it from rolling away during loading operations, can be operated via manual, hydraulic, or electrical systems; this system can replace or work in conjunction with wheel chocks.
A utility trailer is a general purpose trailer designed to by towed by a light vehicle and to carry light, compact loads of up to a few metric tonnes. It typically has short metal sides (either rigid or folding) to constrain the load, and may have cage sides, and a rear folding gate or ramps. Utility trailers do not have a roof.
Another popular type of flatbed trailer is a step deck (or drop deck) with approximately 2 feet lower deck and low profile wheels to accommodate taller loads, without hitting low bridges or tunnels. These stepdecks can come with loading ramps to allow vehicles to roll on and off of the back from ground level.
A container chassis, also called intermodal chassis or skeletal trailer, is a type of semi-trailer designed to securely carry an intermodal container. Chassis are used by truckers to deliver containers between ports , railyards, container depots, and shipper facilities, [ 1 ] : 2–3 and are thus a key part of the intermodal supply chain .