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Low loader, semi low loader, extendable flat trailer, crane trailer or low loader dolly combination – the differences can seem subtle, but in practice the right choice determines whether your transport runs smoothly or hits a wall. Xiffix trades in all types daily and helps buyers and transport operators find the right trailer.
On this page we compare all 4 categories side by side on the criteria that matter in practice: loading height, load capacity, load length, manoeuvrability and application.
By transport requirement: which type do you choose?
My load is extremely tall – what do I choose?
If the height of your load is the limiting factor, the low loader is the right choice. With a loading floor height of just 40–65 cm in the recessed section, even the tallest machines stay within the legal 4-metre transport height.
The semi low loader (85–105 cm) is a good second choice when the load is not extremely tall but is heavy. The extendable flat trailer (115–140 cm) is almost never appropriate for tall loads.
- Low loader: loading height 40–65 cm – ideal for machinery with a high ride profile
- Semi low loader: loading height 85–105 cm – suitable for standard construction machinery
- Flat trailer: loading height 115–140 cm – for low, long loads only
My load is very long – what do I choose?
For long, self-supporting loads such as steel structures, concrete beams, pipes or wind turbine tower sections, the extendable flat trailer is the standard choice. It extends to 30+ metres and has a completely flat loading floor with no obstacles.
The semi low loader is also available in extendable versions up to approx. 42 metres – a better choice when the load is both long and heavy (up to 115 tonnes).
- Extendable flat trailer: up to 30+ m, up to 45 T – ideal for steel, pipes, masts
- Extendable semi low loader: up to ~42 m, up to 115 T – for heavy and long loads
- Steered trailer: combinable with extendable semi for long routes with tight bends
I have no crane on site – what do I choose?
If you work at locations without external lifting equipment – construction sites, agricultural land, remote industrial premises – the crane trailer is the only self-sufficient solution. The mounted hydraulic loader crane (10 to 100+ tonne-metres) makes you independent of external lifting equipment.
All other types depend on external loading equipment such as a crane, forklift or loading ramps for self-propelled machinery.
- Crane trailer: self-loading and unloading at any location
- Low loader and semi low loader with ramps: self-propelled equipment can drive on
- Flat trailer: always dependent on external loading equipment
My route has narrow roads or tight bends – what do I choose?
For transport on narrow roads, confined industrial sites or loads that need to be positioned precisely, the steered trailer is essential. With hydraulically steered axles, the combination turns significantly tighter than a rigid trailer.
A self-tracking variant already offers more manoeuvrability than a rigid trailer but does not work when reversing. Hydraulic steering is the complete solution.
- Hydraulically steered trailer: actively steered, including when reversing
- Self-tracking trailer: passively steered, forward only
- Rigid trailer: for straight routes with no manoeuvring challenges
Can I combine trailer types?
Yes – and this is very common in practice. A semi low loader can be hydraulically steered (combination 2 + 4). A crane trailer can be built on a semi low loader chassis (combination 2 + 5). An extendable flat trailer can be self-tracking (combination 3 + 4).
At Xiffix we regularly stock these combined configurations. We trade in trailers from A-brand manufacturers including Broshuis, Doll, Faymonville, Goldhofer and Nooteboom – in all configurations and combinations.
Quick decision guide – 3 questions
Answer these 3 questions and you'll know in 30 seconds which trailer type suits your transport:
Question 1: Is loading height the limiting factor?
Yes, load is extremely tall → Low loader. Yes, load is standard height → Semi low loader. No → go to question 2.
Question 2: Is load length the limiting factor?
Yes, load is long but not tall → Extendable flat trailer. Yes, load is long and heavy → Extendable semi low loader. No → go to question 3.
Question 3: What is the biggest challenge on site?
No external lifting equipment available → Crane trailer. Narrow roads or tight bends → Steered trailer. No particular challenge → Semi low loader is the most versatile choice.
FAQ – Comparing special trailers
What is the key difference between a low loader and a semi low loader?
The difference is in the loading height. On a semi low loader, the loading floor sits at 85–105 cm above road level. On a low loader, the chassis has an additional recessed section that brings the loading height down to 40–65 cm. Choose a low loader when your load is truly tall or has a high centre of gravity. Choose a semi low loader for most standard construction machinery and heavy transport.
When is an extendable flat trailer better than a semi low loader?
When the load is long but not tall. A steel structure of 25 metres, concrete beams or pipes fit perfectly on a flat trailer. The completely flat floor without a gooseneck makes loading easier and more flexible. A semi low loader has a higher gooseneck that can be an obstacle for long, light loads.
Is a steered trailer always better than a rigid trailer?
Not always. A steered trailer costs more to buy and maintain. For transport on wide roads or motorways without manoeuvring challenges, a rigid trailer is cheaper and equally effective. The added value of steering shows on narrow routes, confined sites and long loads with overhang.
Can I use a crane trailer for long transport as well?
A crane trailer is primarily designed to combine transport and lifting on site. The crane takes up load space and adds tare weight, limiting the available load capacity and length. For purely long transport, an extendable flat trailer is more efficient. Some crane trailers are extendable – a useful combination for building materials of varying length.
Which trailer type is the most versatile?
The semi low loader. It combines a relatively low loading floor with high flexibility in load capacity (up to 115 tonnes), load length (up to 42 m extendable) and applications. It handles construction machinery, concrete elements, steel structures, wind turbine components and containers. That makes it the most common trailer in heavy and special transport.
How do I choose between self-tracking and hydraulic steering?
Self-tracking steering is cheaper and lower-maintenance – the axles steer passively based on friction and only work when driving forward. Hydraulic steering is more active, works when reversing and is ideal for precision work in confined spaces. Choose hydraulic if you regularly work on narrow sites or construction areas. Choose self-tracking if forward manoeuvrability is sufficient.