How do semi-trailers and full trailers differ from each other?

A traction semi-trailer involves a separate front unit towing a cargo box, where the front can be detached from the cargo box. There are two types of tractor-trailer combinations: the semi-trailer, where the trailer itself carries a cargo box but an additional box can be towed behind for convenience, allowing for separation. This is commonly referred to as a semi-trailer. The other is the full trailer, which, as the name suggests, can be separated from the towing vehicle and requires a separate vehicle for towing.

In the transportation sector of my country, side wall semi-trailers are prevalent and play a crucial role in cargo transportation. Depending on the application, semi-trailers can be categorized into various types such as column, fence, low-bed flat, vocations, tank, container, skeleton, and more.

Typically, semi-trailers lack a driving force and rely on the power of the towing vehicle, requiring the semi-trailer to be pulled along. Hence, many in the industry colloquially refer to side wall semi-trailers as trailers or mops.

The semi-trailer and trailer are not identical models, though both refer to non-self-propelled vehicles requiring an external power source. The primary distinction lies in their connection methods to the towing vehicle. The semi-trailer connects via a saddle and traction system, secured through locking mechanisms, while the trailer connects through a traction rod, hanging from the towing vehicle's hook.

Visually, when connected, the semi-trailer's front end rests on the back of the towing vehicle, utilizing the saddle for steering. In contrast, the trailer's connection allows for some movement or swinging, enhancing flexibility for complex road conditions but potentially impacting stability during travel.

Due to these characteristics, trailers are commonly used in fields, airports, stations, and logistics parks, catering to specialized freight scenarios. Both semi-trailers and trailers generally employ support bridges without driving or steering capabilities. Semi-trailers can range in bridge tonnage from 13T to 25T, with lightweight options around 10T and heavy-duty versions exceeding 80T. Trailers, on the other hand, tend to have lower tonnage capacities, typically between 3T and 10T, with 5T and 8T being the most common.