Dropside trailers are a common type of freight trailer, capable of hauling building materials, steel, and bagged goods, making them a versatile choice. As one of the most basic trailer types, dropside trailers, with their flexible structure and wide applicability, have become a popular choice for many logistics companies and individual operators.
This article, written by Fudeng, provides a comprehensive introduction to dropside trailers from the perspectives of definition, usage, and characteristics, hoping to provide you with some helpful reference.
What is a dropside trailer?
A dropside trailer features an open cargo platform with foldable, removable, or fixed metal side panels (typically 0.4-1.5 meters in height). It’s primarily used for transporting general-purpose cargo requiring no special protection.
The trailer’s core structure consists of a frame (including towing attachment), axles (including suspension), a braking system, and a Railing cargo platform. The side panels are divided into left and right side panels and a rear panel. Some models offer fully removable or foldable side panels, further enhancing loading and unloading flexibility.
Compared to enclosed box trailers, dropside trailers lack an enclosed cargo bed and have a completely open cargo platform. Compared to flatbed trailers, dropside trailers utilize side panels to prevent cargo from falling, offering a balanced design that combines “open loading” with “basic protection.”
Dropside trailers are highly adaptable to diverse transportation needs, from industrial building materials to agricultural supplies, from small and medium-sized equipment to municipal supplies.
Types of cargo transported by dropside trailers
Dropside trailers offer flexible load capacity, convenient loading and unloading, and strong adaptability, meeting medium- and long-distance, high-capacity freight transport needs. They are widely used in industries such as industry, infrastructure, agriculture, and commerce. The following are typical applications:
Bulk cargo: such as coal, sand, gravel, and grain. The open cargo platform facilitates direct loading and unloading by loaders and excavators, and the sidewall effectively prevents spillage, making them suitable for short- and medium-distance bulk material transfers.
Small and medium-sized piece cargo: such as home appliances, furniture, and bagged fertilizers. The sidewall height can be adjusted to accommodate varying cargo sizes, and ropes can be used to secure them to prevent damage during transport.
Irregularly shaped cargo: such as small construction machinery and prefabricated components. With no overhead space restrictions, the securing method can be adjusted to suit the cargo shape, meeting the transport needs of non-standard-sized cargo.
What is the difference between a fence cargo trailer and a dropside trailer?
Dropside trailers are often confused with fence cargo trailers. While both are open-bed trailers, they differ significantly. Dropside trailers are primarily used for transporting general cargo in fixed locations, while fence cargo trailers are more suitable for transporting more diverse and specialized cargo. Choosing between these two types requires considering the cargo’s characteristics and the intended transport scenario.
| Feature | Dropside trailers | Fence cargo trailers |
| structure | The cargo platform is surrounded by 0.4-1.5m metal railings and has no top structure. | Add a metal grid frame to the fence (can be covered with tarpaulin) |
| Protection | Anti-slip (horizontal/vertical protection), no rain or sun protection | The tarpaulin can be used to protect against rain and sun, and the grid frame can enhance the anti-dumping effect of the cargo |
| Applicable goods | General cargo that is not fragile and does not require rain protection (steel, equipment, bagged materials) | Goods that require ventilation, pressure protection, or temporary rain protection (livestock, poultry, vegetables, and fruits) |
| Ease of loading and unloading | The side/rear panels are foldable, supporting multi-directional loading and unloading | The tarpaulin must be removed before loading and unloading, and the efficiency is slightly lower than the fence type |
Selection suggestion: If you are transporting regular goods (such as steel, bagged grain, small and medium-sized equipment) and do not need to protect against rain and sun, you should give priority to choosing a dropside trailer. If the goods need to be ventilated (such as live pigs, fresh vegetables) or occasionally protected from rain (such as daily necessities packaged in cartons), you can choose a Fence cargo trailer (used with a tarpaulin).
Advantages and disadvantages of dropside trailers
Advantages
Highly Versatile: It can transport a variety of cargo, including steel, equipment, and bagged supplies, without modification, meeting diverse transport needs and reducing the cost of purchasing multiple trailer types.
High Loading and Unloading Efficiency: The foldable and removable side and rear tailgates support multi-directional loading and unloading by forklifts and cranes, reducing loading and unloading time by 20%-30% compared to enclosed box trailers.
Low Purchase and Maintenance Costs: Without complex structures like an enclosed cargo bed or grid frame, the purchase cost is 15%-20% lower than a flatbed trailer and 25%-30% lower than an enclosed box trailer. Maintenance only requires regular inspection of the sideboard bolts and brake system, resulting in low repair costs.
Flexible Load Capacity: The platform has no ceiling restrictions. Within the approved load capacity, the load capacity can be adjusted to suit the height of the cargo (e.g., transporting bags 1.8 meters high), eliminating the need to worry about insufficient space.
Disadvantages
Weak protection: No rain, sun, or theft protection. When transporting moisture-sensitive goods (such as cartons and electronics), a waterproof tarp is required (adding 10-15 minutes to the operation time).
High wind resistance at high speeds: Wind resistance at high speeds is 15%-20% higher than that of a closed box trailer, increasing the tractor’s fuel consumption (approximately 1-2 liters per 100 kilometers). This increases operating costs for long-distance travel.
High cargo securing requirements: When transporting cylindrical goods (such as steel pipes and cement pipes), sidewalls alone cannot fully secure them. Additional steel wire ropes and rope tensioners are required to secure them, otherwise the goods may roll.
Application limitations: Unsuitable for transporting goods that require ventilation (such as livestock and poultry, fresh vegetables), nor for sealed transport (such as chemical raw materials). Its application is primarily in general freight transport without special protection requirements.
Loading steps and precautions
Loading steps
Preliminary Inspection: Check the sidewalls for deformation, connecting bolts for tightness, and the cargo platform for sharp protrusions to avoid scratching the cargo. Verify the trailer’s rated load (e.g., for a 30-ton trailer, the cargo weight should be kept within 22 tons, allowing for the weight of the tractor and trailer). Check the braking system and lighting for proper function to ensure compliance with roadworthiness requirements.
Cargo Planning and Placement: Follow the principles of “heavy cargo at the bottom, light cargo at the top,” “large cargo in front, small cargo in the back,” and “even weight distribution.” For example, when transporting steel and bagged cement, place the steel at the bottom of the cargo platform (closer to the tractor end) and the bagged cement on top to prevent damage to the lighter cargo. The cargo weight should be evenly distributed on both sides of the cargo platform to prevent the trailer from tipping over during travel.
Cargo Securing: Use wire ropes and rope tensioners to secure the cargo to the cargo platform guardrails. Focus on reinforcing the cargo’s ends and easily slippery areas (such as cylindrical steel pipes) to prevent lateral or vertical movement. If the cargo exceeds the side rails (e.g., cargo 1.8 meters high), add horizontal ropes to the top and place rubber mats between the cargo and the side rails to reduce friction damage.
Side Rail Repositioning and Inspection: After securing the cargo, reposition and lock the folded side and rear rails. Check that the side rail latches are secure. Walk around the vehicle to confirm that the cargo is not oversized (no more than 2.5 meters wide) or oversized (no more than 4 meters high) and complies with road transport regulations.
precautions
Overloading is strictly prohibited: Overloading can cause sidewall deformation and axle damage, and it can also affect the tractor’s braking performance. For example, if a trailer with a rated load of 22 tons is loaded with 30 tons of cargo, the braking distance will increase by 30%-40%, which can easily lead to rear-end collisions.
Rain and sun protection measures: When transporting moisture-sensitive and sun-sensitive cargo, a thick waterproof tarp must be used. The edges of the tarp must be secured to the sidewall to prevent rainwater from seeping through gaps. When transporting plastic and rubber products in the summer, a sunshade tarp should be used to prevent the cargo from deforming due to high temperatures.
Driving and operating procedures: Avoid sudden acceleration, braking, and sharp turns while driving to prevent the cargo from sliding due to inertia. When driving on bumpy roads (such as rural dirt roads), slow down to minimize collisions between the cargo and the sidewall.
En-route inspections: Stop every 100 kilometers or 1.5 hours to inspect the cargo’s securing (e.g., whether the wire rope is loose) and the condition of the sidewall (e.g., whether the lock is detached). Make timely adjustments if any problems are found.
With their flexibility and efficiency, Dropside trailers have become a vital force in the road freight industry. Fudeng Auto, with its years of experience in freight equipment, is a trusted choice in flatbed trailer manufacturing. If you have any questions, please feel free to contact us. We look forward to working with you.
