Head to head
Ifor Williams HB510XL vs Ifor Williams LM146
The Ifor Williams LM146 is 555kg lighter empty and carries 555kg more.
Last reviewed 13 September 2026
Key differences
- Unladen weight: the Ifor Williams HB510XL weighs 555kg more empty.
- Payload: the Ifor Williams LM146 carries 555kg more.
Specifications side by side
| Ifor Williams HB510XL | Ifor Williams LM146 | |
|---|---|---|
| Gross weight | 3500kg | 3500kg |
| Unladen weight | 1290kg | 735kg |
| Payload | 2210kg | 2765kg |
| Internal length | 4.25m | - |
| Internal width | 1.74m | - |
| Overall length | - | 5.60m |
| Overall width | - | 2.10m |
| Bed | - | 4.23m / 13'9" ((internal) length); 1.98m / 6'5" ((internal) width) |
| Tyres | - | 195/60R12C |
Sources: Ifor Williams HB510XL, Ifor Williams LM146. 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 LM146 if...
- you want one that is 555kg lighter empty
- you want one that carries 555kg more
The LM146 is a general-purpose flatbed aimed at landscaping, construction and plumbing trades that need a long, wide load bed with a high payload on a single 3500kg-braked chassis. It is used where loads are bulky or awkwardly shaped rather than plant machinery, which typically goes on the ramped GX range instead.
Listed by
- Blains Trailers & Tyres - Hemel Hempstead, Great Gaddesden
- G-Tec Trailers - Thetford, Holme Hale
- Barnwell Trailers Ltd - Peterborough, Oundle, Barnwell
Common questions
What is the difference between the Ifor Williams HB510XL and the Ifor Williams LM146?
The Ifor Williams LM146 is 555kg lighter empty and carries 555kg more. The Ifor Williams HB510XL is a an extra-length double horsebox trailer; the Ifor Williams LM146 is a a twin-axle flatbed goods trailer in the heavier-duty LM range..
Which is lighter, the Ifor Williams HB510XL or the Ifor Williams LM146?
The Ifor Williams LM146. It is 555kg lighter empty than the Ifor Williams HB510XL.
Which carries more, the Ifor Williams HB510XL or the Ifor Williams LM146?
The Ifor Williams LM146, by 555kg.
Can I tow the Ifor Williams HB510XL or the Ifor Williams LM146 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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