Head to head
Ifor Williams HB511 vs Ifor Williams LM166
The Ifor Williams LM166 is rated 800kg heavier gross and is 205kg lighter empty.
Last reviewed 13 September 2026
Key differences
- Gross weight: the Ifor Williams LM166 is rated 800kg heavier gross.
- Unladen weight: the Ifor Williams HB511 weighs 205kg more empty.
Specifications side by side
| Ifor Williams HB511 | Ifor Williams LM166 | |
|---|---|---|
| Gross weight | 2,700kg | 3500kg |
| Unladen weight | 1,000kg | 795kg |
| Internal length | 3.52m | - |
| Internal width | 1.79m | - |
| Brakes | Braked | - |
| Payload | - | 2705kg |
| Internal bed | - | 4.77m x 1.98m |
Sources: Ifor Williams HB511, Ifor Williams LM166. Figures vary by model year and options, so check with the supplier before you commit.
Buy or hire the HB511 if...
The wider step up from the HB506, for larger horses or owners who want more room in transit. The extra 12cm of internal width and 36cm of length cost 80kg unladen, which is worth checking against your tow vehicle before choosing it over the HB506.
Listed by
- Trek-Trailers Lincolnshire - Doncaster, Belton
- Trek-Trailers Suffolk - Bury Saint Edmunds
- R M Trailer Centre - Middlesbrough, North Ormesby
- Blains Trailers & Tyres - Hemel Hempstead, Great Gaddesden
- Horse Trailer Sales - Robertsbridge, Staplecross
- Trek-Trailers Three Counties - Hereford
Buy or hire the LM166 if...
- you want one that is rated 800kg heavier gross
- you want one that is 205kg lighter empty
Bought by contractors and hauliers who regularly carry longer loads, such as fencing materials or several pallets, and need more deck length than the LM106 or LM126 provide.
Listed by
- G-Tec Trailers - Thetford, Holme Hale
- Blains Trailers & Tyres - Hemel Hempstead, Great Gaddesden
Common questions
What is the difference between the Ifor Williams HB511 and the Ifor Williams LM166?
The Ifor Williams LM166 is rated 800kg heavier gross and is 205kg lighter empty. The Ifor Williams HB511 is a two-horse trailer, twin axle, wider body; the Ifor Williams LM166 is a a long-bed flatbed trailer.
Which is lighter, the Ifor Williams HB511 or the Ifor Williams LM166?
The Ifor Williams LM166. It is 205kg lighter empty than the Ifor Williams HB511.
Can I tow the Ifor Williams HB511 or the Ifor Williams LM166 on a car licence?
Yes, as far as the licence goes. Both are rated at or under 3,500kg gross, and a car (B) licence has covered towing up to 3,500kg since 16 December 2021. Your car still has to be rated to tow the loaded weight - check the handbook or the VIN plate.
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