Low-bed semi-trailers are a type of semi-trailers specially designed to transport over-high or over-wide goods, which can be divided into several main types according to their design and function:

Stationary low-bed semi-trailers: This is the most common type of low-bed semi-trailers. Its chassis height is relatively low, making it suitable for transporting goods with large heights. However, its slab height is usually fixed and not adjustable. 

Retractable low-bed semi-trailer: This type of low-bed semi-trailer has a retractable design that can be adjusted according to the size of the cargo. This makes it more flexible and able to adapt to different sizes of goods.

Adjustable low-bed semi-trailer: Similar to the retractable semi-trailer, the flat height of the adjustable low-bed semi-trailer is also adjustable, but it usually uses a mechanical or hydraulic system for height adjustment. 

Drop Plate Low Flatbed Semi-Trailer: This semi-trailer is designed to be relatively low in the front and rear flat areas, while the middle section is higher. This design helps to cope with the transportation needs of goods of different heights and improves the convenience of loading and unloading.

-Foldable low-bed semi-trailer: This type of semi-trailer has a foldable flatbed design, which makes it foldable when there is no cargo, reducing the empty space of the vehicle and improving transportation efficiency. 

Each type of low-bed semi-trailer has its own unique advantages, and the right type can be selected according to the specific cargo transportation needs. For example, for scenarios that need to accommodate different sizes of goods, a retractable or adjustable low-bed semi-trailer may be more suitable. And for the situation that requires frequent loading and unloading of goods, the lowering plate low-bed semi-trailer may be more advantageous.

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