Head to head
Ifor Williams HB510XL vs Ifor Williams HB511
The Ifor Williams HB510XL is rated 800kg heavier gross and is 73cm (2.5ft) longer inside. The Ifor Williams HB511 is 290kg lighter empty and is 5cm wider inside.
Last reviewed 13 September 2026
Key differences
- Gross weight: the Ifor Williams HB510XL is rated 800kg heavier gross.
- Unladen weight: the Ifor Williams HB510XL weighs 290kg more empty.
- Internal length: the Ifor Williams HB510XL is 73cm (2.5ft) longer inside.
- Internal width: the Ifor Williams HB511 is 5cm wider inside.
Specifications side by side
| Ifor Williams HB510XL | Ifor Williams HB511 | |
|---|---|---|
| Gross weight | 3500kg | 2,700kg |
| Unladen weight | 1290kg | 1,000kg |
| Internal length | 4.25m | 3.52m |
| Internal width | 1.74m | 1.79m |
| Payload | 2210kg | - |
| Brakes | - | Braked |
Sources: Ifor Williams HB510XL, Ifor Williams HB511. Figures vary by model year and options, so check with the supplier before you commit.
Buy or hire the HB510XL if...
- you want one that is rated 800kg heavier gross
- you want one that is 73cm (2.5ft) longer 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
Buy or hire the HB511 if...
- you want one that is 290kg lighter empty
- you want one that is 5cm wider inside
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
Common questions
What is the difference between the Ifor Williams HB510XL and the Ifor Williams HB511?
The Ifor Williams HB510XL is rated 800kg heavier gross and is 73cm (2.5ft) longer inside. The Ifor Williams HB511 is 290kg lighter empty and is 5cm wider inside. The Ifor Williams HB510XL is a an extra-length double horsebox trailer; the Ifor Williams HB511 is a two-horse trailer, twin axle, wider body.
Which is lighter, the Ifor Williams HB510XL or the Ifor Williams HB511?
The Ifor Williams HB511. It is 290kg lighter empty than the Ifor Williams HB510XL.
Can I tow the Ifor Williams HB510XL or the Ifor Williams HB511 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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