Head to head
Ifor Williams HB403 vs Ifor Williams HB506
The Ifor Williams HB506 is rated 1 tonnes heavier gross and is 37cm (1ft) wider inside. The Ifor Williams HB403 is 153kg lighter empty.
Last reviewed 13 September 2026
Key differences
- Gross weight: the Ifor Williams HB506 is rated 1 tonnes heavier gross.
- Internal width: the Ifor Williams HB506 is 37cm (1ft) wider inside.
- Unladen weight: the Ifor Williams HB506 weighs 153kg more empty.
- Internal length: the Ifor Williams HB506 is 8cm longer inside.
Specifications side by side
| Ifor Williams HB403 | Ifor Williams HB506 | |
|---|---|---|
| Gross weight | 1600kg | 2,600kg |
| Unladen weight | 767kg | 920kg |
| Internal length | 3.08m | 3.16m |
| Internal width | 1.30m | 1.67m |
| Payload | 833kg | - |
| Brakes | - | Braked |
Sources: Ifor Williams HB403, Ifor Williams HB506. 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 153kg 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 HB506 if...
- you want one that is rated 1 tonnes heavier gross
- you want one that is 37cm (1ft) wider inside
- you want one that is 8cm longer inside
The mainstream two-horse trailer in Britain, used by private owners and small yards. Its comparatively low unladen weight for the class is the practical point: it widens the range of 4x4s and large SUVs that can legally and comfortably tow it.
Listed by
- R M Trailer Centre - Middlesbrough, North Ormesby
- Blains Trailers & Tyres - Hemel Hempstead, Great Gaddesden
- Horse Trailer Sales - Robertsbridge, Staplecross
- Barnwell Trailers Ltd - Peterborough, Oundle, Barnwell
Common questions
What is the difference between the Ifor Williams HB403 and the Ifor Williams HB506?
The Ifor Williams HB506 is rated 1 tonnes heavier gross and is 37cm (1ft) wider inside. The Ifor Williams HB403 is 153kg lighter empty. The Ifor Williams HB403 is a a compact single-horse or two-pony horsebox trailer; the Ifor Williams HB506 is a two-horse trailer, twin axle.
Which is lighter, the Ifor Williams HB403 or the Ifor Williams HB506?
The Ifor Williams HB403. It is 153kg lighter empty than the Ifor Williams HB506.
Can I tow the Ifor Williams HB403 or the Ifor Williams HB506 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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