Head to head
Ifor Williams HB403 vs Ifor Williams HBX506
The Ifor Williams HBX506 carries 902kg more and is rated 1 tonnes heavier gross. The Ifor Williams HB403 is 98kg lighter empty.
Last reviewed 13 September 2026
Key differences
- Payload: the Ifor Williams HBX506 carries 902kg more.
- Gross weight: the Ifor Williams HBX506 is rated 1 tonnes heavier gross.
- Internal width: the Ifor Williams HBX506 is 37cm (1ft) wider inside.
- Unladen weight: the Ifor Williams HBX506 weighs 98kg more empty.
- Internal length: the Ifor Williams HBX506 is 18cm longer inside.
Specifications side by side
| Ifor Williams HB403 | Ifor Williams HBX506 | |
|---|---|---|
| Gross weight | 1600kg | 2600kg |
| Unladen weight | 767kg | 865kg |
| Payload | 833kg | 1735kg |
| Internal length | 3.08m | 3.26m |
| Internal width | 1.30m | 1.67m |
Sources: Ifor Williams HB403, Ifor Williams HBX506. 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 98kg 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 HBX506 if...
- you want one that carries 902kg more
- you want one that is rated 1 tonnes heavier gross
- you want one that is 37cm (1ft) wider inside
- you want one that is 18cm longer inside
A mid-size horsebox for owners moving one or two horses who want the updated HBX styling and features rather than the standard HB range trailer.
Listed by
- R M Trailer Centre - Middlesbrough, North Ormesby
- Barnwell Trailers Ltd - Peterborough, Oundle, Barnwell
Common questions
What is the difference between the Ifor Williams HB403 and the Ifor Williams HBX506?
The Ifor Williams HBX506 carries 902kg more and is rated 1 tonnes heavier gross. The Ifor Williams HB403 is 98kg lighter empty. The Ifor Williams HB403 is a a compact single-horse or two-pony horsebox trailer; the Ifor Williams HBX506 is a a double horsebox trailer from Ifor Williams' HBX range.
Which is lighter, the Ifor Williams HB403 or the Ifor Williams HBX506?
The Ifor Williams HB403. It is 98kg lighter empty than the Ifor Williams HBX506.
Which carries more, the Ifor Williams HB403 or the Ifor Williams HBX506?
The Ifor Williams HBX506, by 902kg.
Can I tow the Ifor Williams HB403 or the Ifor Williams HBX506 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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