Ifor Williams Trailers LM 166G
Built: 2010 · Series: LM
More machines from model year 2010
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Ifor Williams Trailers LM – trailer range from the Welsh manufacturer: braked 3.5-tonne trailers on a galvanised chassis, 770 to 1,094 kg unladen weight, 2.0 to 2.3 m width
This page gathers the LM range from Ifor Williams Trailers, the Welsh trailer manufacturer from Cynwyd founded by Ifor Williams and known for its hot-dip galvanised chassis. The models LM 125 G, LM 146 63, LM 166 G/G3 and LM 186 G3 use the first number to give the approximate payload in steps of a hundred kilograms, while G and G3 mark equipment or axle variants. Trailers could remain unbraked up to a gross weight of 750 kg; every LM version, at 3,500 kg, sits well above that limit and carries the overrun brake required for class O2, towed on a category B licence or, for heavier combinations, category BE.
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The register lists here 8 versions with unladen weights from 770 to 1,094 kg, a uniform gross weight of 3,500 kg and widths from 2,020 to 2,330 mm; one length of 6,160 mm is documented.
The LM range belongs to Ifor Williams's core programme for the British and, increasingly, continental European market, where the galvanised chassis and sturdy steel construction have made the trailers a common standard in agriculture, building trades and private use behind cars and vans.
On a used Ifor Williams trailer, despite the galvanising, welds and chassis joints should be checked for corrosion, along with the condition of the side boards and ramps, the braking system and overrun brake, the axles and tyres, and the tightness of the lighting system; parts are readily available through Ifor Williams's dense dealer network in Britain and Europe. On these trailers, the 50 mm ball coupling is the common attachment; the tandem axle on leaf springs spreads the load onto the tyres more evenly, something the galvanising alone cannot provide.
Sources: SpecCodex register, model data: Ifor Williams Trailers LM
Technical data
Dimensions and weights
| Width | 2,030 mmcorrect |
|---|---|
| Wheelbase | 4,250 mmcorrect |
| Unladen weight | 840 kgcorrect |
| Gross vehicle weight | 3,500 kgcorrect |
Drivetrain and chassis
| Top speed | 100 km/hcorrect |
|---|
Frequently asked questions
How much does the Ifor Williams Trailers LM 166G weigh?
The unladen weight is 840 kg.
What is the gross vehicle weight of the Ifor Williams Trailers LM 166G?
3,500 kg.
Up to what speed is the Ifor Williams Trailers LM 166G approved?
Approved up to 100 km/h.
When was the Ifor Williams Trailers LM 166G built?
Production years: 2010.
What to check before buying
- Search the frame and welds at the axle mounts — that is where cracks start.
- Check the brakes and the last inspection in the papers.
- Work the gross weight against the towing vehicle before buying.
- Compare the chassis number with the papers.
- Look at the floor, cover or body from the inside — rust does not show from outside.
A general list for this type of machine — no substitute for an inspection or an appraiser.
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This page carries 7 individual figures for this model. They come from 1 recorded source; every figure can be traced there. What we cannot document is not here — we leave gaps open rather than estimate them.
The technical data on this page comes from official vehicle registration records (RDW/Traficom), not from the manufacturer.
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Other models in this series
Sources: RDW — Dutch national vehicle register (retrieved August 2026) · How we check the data
Trailer in 3D section
Turn the model, look inside and click an assembly — each one is explained.
