Head to head
Ifor Williams HB511 vs Ifor Williams LM146
The Ifor Williams LM146 is 265kg lighter empty and is rated 800kg heavier gross.
Last reviewed 13 September 2026
Key differences
- Unladen weight: the Ifor Williams HB511 weighs 265kg more empty.
- Gross weight: the Ifor Williams LM146 is rated 800kg heavier gross.
Specifications side by side
| Ifor Williams HB511 | Ifor Williams LM146 | |
|---|---|---|
| Gross weight | 2,700kg | 3500kg |
| Unladen weight | 1,000kg | 735kg |
| Internal length | 3.52m | - |
| Internal width | 1.79m | - |
| Brakes | Braked | - |
| Overall length | - | 5.60m |
| Overall width | - | 2.10m |
| Bed | - | 4.23m / 13'9" ((internal) length); 1.98m / 6'5" ((internal) width) |
| Payload | - | 2765kg |
| Tyres | - | 195/60R12C |
Sources: Ifor Williams HB511, Ifor Williams LM146. 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 LM146 if...
- you want one that is 265kg lighter empty
- you want one that is rated 800kg heavier gross
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 HB511 and the Ifor Williams LM146?
The Ifor Williams LM146 is 265kg lighter empty and is rated 800kg heavier gross. The Ifor Williams HB511 is a two-horse trailer, twin axle, wider body; the Ifor Williams LM146 is a a twin-axle flatbed goods trailer in the heavier-duty LM range..
Which is lighter, the Ifor Williams HB511 or the Ifor Williams LM146?
The Ifor Williams LM146. It is 265kg lighter empty than the Ifor Williams HB511.
Can I tow the Ifor Williams HB511 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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