Head to head
Ifor Williams HB403 vs Ifor Williams LM166
The Ifor Williams LM166 carries 1,872kg more and is rated 1.9 tonnes heavier gross. The Ifor Williams HB403 is 28kg lighter empty.
Last reviewed 13 September 2026
Key differences
- Payload: the Ifor Williams LM166 carries 1,872kg more.
- Gross weight: the Ifor Williams LM166 is rated 1.9 tonnes heavier gross.
- Unladen weight: the Ifor Williams LM166 weighs 28kg more empty.
Specifications side by side
| Ifor Williams HB403 | Ifor Williams LM166 | |
|---|---|---|
| Gross weight | 1600kg | 3500kg |
| Unladen weight | 767kg | 795kg |
| Payload | 833kg | 2705kg |
| Internal length | 3.08m | - |
| Internal width | 1.30m | - |
| Internal bed | - | 4.77m x 1.98m |
Sources: Ifor Williams HB403, Ifor Williams LM166. Figures vary by model year and options, so check with the supplier before you commit.
Buy or hire the HB403 if...
- you want one that is 28kg lighter empty
The smallest trailer in the HB horsebox range, bought by owners of a single horse or a couple of ponies who want the lightest legal option that can still be towed by a mid-size car.
Listed by
- Horse Trailer Sales - Robertsbridge, Staplecross
- Barnwell Trailers Ltd - Peterborough, Oundle, Barnwell
Buy or hire the LM166 if...
- you want one that carries 1,872kg more
- you want one that is rated 1.9 tonnes heavier gross
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 HB403 and the Ifor Williams LM166?
The Ifor Williams LM166 carries 1,872kg more and is rated 1.9 tonnes heavier gross. The Ifor Williams HB403 is 28kg lighter empty. The Ifor Williams HB403 is a a compact single-horse or two-pony horsebox trailer; the Ifor Williams LM166 is a a long-bed flatbed trailer.
Which is lighter, the Ifor Williams HB403 or the Ifor Williams LM166?
The Ifor Williams HB403. It is 28kg lighter empty than the Ifor Williams LM166.
Which carries more, the Ifor Williams HB403 or the Ifor Williams LM166?
The Ifor Williams LM166, by 1,872kg.
Can I tow the Ifor Williams HB403 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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