Trailer dimensions vary depending on the trailer type and configuration. A standard curtainsider typically has a loading length of 13.60 metres, an internal width of approximately 2.44 to 2.48 metres and an internal height of around 2.65 to 2.70 metres. For taller cargo, a mega trailer with an internal height of up to approximately 3 metres may be suitable. Machinery and large components may require a flatbed, semi-lowloader or lowloader.
Exact dimensions vary by manufacturer, chassis, suspension and trailer construction. Standard trailer dimensions should therefore always be treated as reference values. Our technical guide contains schematic drawings and typical dimensions for six commonly used trailer types: curtainsider, box trailer, mega trailer, flatbed, semi-lowloader and lowloader.
View the technical trailer dimensions guide (PDF)
Measure the actual dimensions of your cargo
To select the correct trailer type, the actual transport dimensions are required: length, width and height. Measure the cargo as it will actually be transported. Pallets, wooden supports, transport frames and packaging must be included in the total dimensions.
The dimensions on a machine's technical data sheet are not always the same as its transport dimensions. A machine with a stated height of 2.60 metres may exceed this height once placed on a wooden support. Protruding components and protective packaging must also be taken into account.
The loading method is equally important. Will the cargo be loaded from the rear, from the side or from above by crane? Cargo may theoretically fit within the internal dimensions of a trailer but still be too large for the rear door opening.
Weight and weight distribution
In addition to the dimensions, the cargo weight must be provided correctly. For palletised cargo, the total weight is particularly important. For machinery and large components, weight distribution must also be considered.
A concentrated heavy load on a small surface affects a trailer differently from the same weight distributed over the full loading length. Axle loads, point loads and the centre of gravity may therefore influence the choice of trailer. Simply stating that a machine weighs 20 tonnes is not always sufficient.
Legal dimensions in Belgium, Germany and France
The internal dimensions of a trailer should not be confused with the legal external dimensions of the vehicle and cargo. For a standard tractor and semi-trailer combination, 16.50 metres is an important maximum reference length. The standard maximum width in Belgium, Germany and France is generally 2.55 metres.
In Germany, the vehicle and cargo may generally not exceed a height of 4 metres. German regulations also specify a maximum width of 2.55 metres and dimensional requirements for a 16.50-metre tractor and semi-trailer combination.
In France, official government information defines a vehicle or combination exceeding 16.50 metres in length, 2.55 metres in width and/or 44 tonnes in weight as a convoi exceptionnel. Such transport may require prior authorisation and specific transport conditions.
Cargo exceeding standard dimensions or weights may therefore require an abnormal or exceptional transport permit. Axle loads, vehicle configuration and national rules must also be considered. The legal requirements should always be checked for the complete transport route.
Which trailer do you need?
Start with six key details: the actual length, width and height of the cargo, its total weight, the weight distribution and the loading method. Based on this information, it can be determined whether a standard curtainsider is sufficient or whether a mega trailer, flatbed, semi-lowloader or lowloader is required.
View the technical trailer dimensions guide (PDF) for typical loading lengths, widths, heights, loading deck heights and loading options for each trailer type.