Head to head
Ifor Williams HB403 vs Ifor Williams HB510XL
The Ifor Williams HB510XL carries 1,377kg more and is rated 1.9 tonnes heavier gross. The Ifor Williams HB403 is 523kg lighter empty.
Last reviewed 13 September 2026
Key differences
- Payload: the Ifor Williams HB510XL carries 1,377kg more.
- Gross weight: the Ifor Williams HB510XL is rated 1.9 tonnes heavier gross.
- Unladen weight: the Ifor Williams HB510XL weighs 523kg more empty.
- Internal length: the Ifor Williams HB510XL is 1.17m (4ft) longer inside.
- Internal width: the Ifor Williams HB510XL is 44cm (1.5ft) wider inside.
Specifications side by side
| Ifor Williams HB403 | Ifor Williams HB510XL | |
|---|---|---|
| Gross weight | 1600kg | 3500kg |
| Unladen weight | 767kg | 1290kg |
| Payload | 833kg | 2210kg |
| Internal length | 3.08m | 4.25m |
| Internal width | 1.30m | 1.74m |
Sources: Ifor Williams HB403, Ifor Williams HB510XL. 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 523kg 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 HB510XL if...
- you want one that carries 1,377kg more
- you want one that is rated 1.9 tonnes heavier gross
- you want one that is 1.17m (4ft) longer inside
- you want one that is 44cm (1.5ft) wider inside
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
Common questions
What is the difference between the Ifor Williams HB403 and the Ifor Williams HB510XL?
The Ifor Williams HB510XL carries 1,377kg more and is rated 1.9 tonnes heavier gross. The Ifor Williams HB403 is 523kg lighter empty. The Ifor Williams HB403 is a a compact single-horse or two-pony horsebox trailer; the Ifor Williams HB510XL is a an extra-length double horsebox trailer.
Which is lighter, the Ifor Williams HB403 or the Ifor Williams HB510XL?
The Ifor Williams HB403. It is 523kg lighter empty than the Ifor Williams HB510XL.
Which carries more, the Ifor Williams HB403 or the Ifor Williams HB510XL?
The Ifor Williams HB510XL, by 1,377kg.
Can I tow the Ifor Williams HB403 or the Ifor Williams HB510XL 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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