Head to head
Ifor Williams HB510XL vs Ifor Williams LM166
The Ifor Williams LM166 is 495kg lighter empty and carries 495kg more.
Last reviewed 13 September 2026
Key differences
- Unladen weight: the Ifor Williams HB510XL weighs 495kg more empty.
- Payload: the Ifor Williams LM166 carries 495kg more.
Specifications side by side
| Ifor Williams HB510XL | Ifor Williams LM166 | |
|---|---|---|
| Gross weight | 3500kg | 3500kg |
| Unladen weight | 1290kg | 795kg |
| Payload | 2210kg | 2705kg |
| Internal length | 4.25m | - |
| Internal width | 1.74m | - |
| Internal bed | - | 4.77m x 1.98m |
Sources: Ifor Williams HB510XL, Ifor Williams LM166. Figures vary by model year and options, so check with the supplier before you commit.
Buy or hire the HB510XL if...
For owners of taller or longer horses who find the standard HB511 too tight, giving extra internal length on the same 3500kg chassis so it stays towable by a suitably rated 4x4.
Listed by
- Horse Trailer Sales - Robertsbridge, Staplecross
Buy or hire the LM166 if...
- you want one that is 495kg lighter empty
- you want one that carries 495kg more
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 HB510XL and the Ifor Williams LM166?
The Ifor Williams LM166 is 495kg lighter empty and carries 495kg more. The Ifor Williams HB510XL is a an extra-length double horsebox trailer; the Ifor Williams LM166 is a a long-bed flatbed trailer.
Which is lighter, the Ifor Williams HB510XL or the Ifor Williams LM166?
The Ifor Williams LM166. It is 495kg lighter empty than the Ifor Williams HB510XL.
Which carries more, the Ifor Williams HB510XL or the Ifor Williams LM166?
The Ifor Williams LM166, by 495kg.
Can I tow the Ifor Williams HB510XL 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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