Semi-trailer - Wikipedia
![](https://upload.wikimedia.org/wikipedia/commons/6/6c/HETT.jpg)
Heavy Equipment Transport System - Wikipedia
![](https://upload.wikimedia.org/wikipedia/commons/8/87/TrailerTail_at_the_rear_of_a_semi-trailer.jpg)
File:TrailerTail at the rear of a semi-trailer.jpg - Wikipedia
![](https://upload.wikimedia.org/wikipedia/commons/thumb/2/2a/Scania_%284-series%29_with_EU-trailer._25.25_meters.jpg/220px-Scania_%284-series%29_with_EU-trailer._25.25_meters.jpg)
Semi-trailer - Wikipedia
![](https://upload.wikimedia.org/wikipedia/commons/thumb/2/29/VictoryOilNOLAVachon.jpg/1200px-VictoryOilNOLAVachon.jpg)
History of the trucking industry in the United States - Wikipedia
![](https://upload.wikimedia.org/wikipedia/commons/thumb/d/d6/Dolly_trailer.jpg/1200px-Dolly_trailer.jpg)
Dolly (trailer) - Wikipedia
![](https://upload.wikimedia.org/wikipedia/commons/thumb/8/82/Peterbilt_truck_6.jpg/1200px-Peterbilt_truck_6.jpg)
Tractor unit - Wikipedia
![](https://upload.wikimedia.org/wikipedia/commons/thumb/5/59/Australian_road_train_headed_by_Volvo_NH15.jpg/278px-Australian_road_train_headed_by_Volvo_NH15.jpg)
Semi-trailer truck - Wikipedia
![](https://upload.wikimedia.org/wikipedia/commons/thumb/5/5e/Grain_hopper_trailer_Timpte_01.jpg/220px-Grain_hopper_trailer_Timpte_01.jpg)
Semi-trailer - Wikipedia
![](https://upload.wikimedia.org/wikipedia/commons/e/eb/Skeleton_container_semi-trailer.jpg)
File:Skeleton container semi-trailer.jpg - Wikipedia
![](https://upload.wikimedia.org/wikipedia/commons/thumb/8/82/Czech_Artic.jpg/220px-Czech_Artic.jpg)
Trailer (vehicle) - Wikipedia
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