A lowbed trailer can carry anywhere from 20 tons to over 200 tons. The exact number depends on axle count, axle rating, frame design, and the road weight limits in your operating region. There is no single answer because a lowbed, also called a lowboy trailer, is built around the cargo it needs to move, not a fixed standard size.
As an expert, I will guide how capacity is calculated, what changes it, and which configuration fits different types of heavy equipment.
What Determines a Lowbed Trailer’s Load Capacity
Here are the key factors when choosing a lowbed trailer and how many tons a lowbed trailer can safely haul.
Axle count and rating. Each axle carries a share of the total load. A single axle typically rates between 13 and 20 tons depending on the axle brand and suspension type. Common brands include FUWA, BPW, and JOST. More axles spread the weight further and raise total capacity, though the gain is not purely additive since frame strength and kingpin load also come into play.
Frame and steel grade. The main beam material sets the ceiling on how much weight the structure can bear without deforming. Higher grade steel, such as Q345B or T700, allows a lighter frame with a higher safe load, which is why frame specification matters as much as axle count.
Road and axle weight regulations. Even if a trailer is physically rated for a certain load, local road law may cap it lower. In China, this is governed by the GB 1589 standard, which sets axle load and gross vehicle mass limits for trailers and combination vehicles used on public roads. Operators exporting equipment need to check both the trailer’s rated capacity and the destination country’s axle weight rules before finalizing a configuration.
Typical Capacity by Axle Configuration
2-axle lowbed trailer: around 20 to 40 tons. Suited for smaller excavators, compact loaders, and general construction equipment.
3-axle lowbed trailer: around 40 to 60 tons. A common choice for mid-size crawler equipment and standard heavy machinery transport.
4-axle lowbed trailer: around 60 to 100 tons. Used for larger excavators, bulldozers, and industrial components that exceed standard axle limits.
Multi-axle lowbed trailer (5+ axles): 100 tons and up, with some custom builds rated past 200 tons. The multi axle lowbed trailer often use steerable or hydraulic lifting suspension to manage weight distribution and improve maneuverability on site.
These ranges are general guidance. Actual capacity always depends on the specific axle rating, suspension type, and frame design of the unit in question.
How to Calculate Payload Capacity
The working formula is simple:
Payload Capacity = Gross Vehicle Weight Rating (GVWR) − Trailer Tare Weight
The GVWR is the maximum total weight the trailer is rated to carry, including the cargo, the trailer itself, and any mounted equipment. Tare weight is the trailer’s own weight when empty. Subtract one from the other, and you get the actual cargo weight the trailer can legally and safely carry.
For example, a trailer with a GVWR of 80,000 kg and a tare weight of 20,000 kg has a maximum payload of 60,000 kg, or 60 tons.
Gooseneck Type and Capacity
The gooseneck style does not change the trailer’s rated tonnage directly, but it affects loading method and site flexibility, which matters when matching a trailer to a project.
Fixed gooseneck: permanently attached, loaded via rear ramps. Common on standard 2 and 3-axle lowbeds.
Removable gooseneck (RGN): the front section detaches so the deck drops to ground level for drive-on loading, useful where ramp space is limited.
Detachable hydraulic gooseneck: used on heavier multi-axle units, allowing the deck to lower further for oversized or overheight crawler equipment.
Matching Trailer Capacity to Your Cargo
Choosing the right lowbed comes down to matching machine weight, not just to the trailer’s maximum rating, but with margin for the load’s center of gravity, transport route, and any bridge or axle load restrictions along the way. A trailer rated exactly at the load weight leaves no safety margin and can trigger overload penalties if road conditions or fuel weight shift the total even slightly.
At Shiyun Trailer, we build lowbed and multi-axle trailers across a payload range of 10 to 1000 tons under the GIRDER TRAILER brand, with steerable and hydraulic lifting suspension options for heavier crawler and oversized cargo.
Final Answer:
A lowbed trailer’s tonnage is not a fixed number. It is a result of axle configuration, frame steel grade, and the road regulations in the country of operation. Before ordering, confirm the payload using the GVWR minus tare weight formula, check axle load limits against local standards like GB 1589, and choose a gooseneck type that fits how the cargo will be loaded on site.
