Head to head
Ifor Williams HB510XL vs Richardson Trailers Supreme Ultra
The Ifor Williams HB510XL is 71cm (2.5ft) longer inside. The Richardson Trailers Supreme Ultra is 190kg lighter empty and is 6cm wider inside.
Last reviewed 13 September 2026
Key differences
- Internal length: the Ifor Williams HB510XL is 71cm (2.5ft) longer inside.
- Unladen weight: the Ifor Williams HB510XL weighs 190kg more empty.
- Internal width: the Richardson Trailers Supreme Ultra is 6cm wider inside.
Specifications side by side
| Ifor Williams HB510XL | Richardson Trailers Supreme Ultra | |
|---|---|---|
| Unladen weight | 1290kg | 1100 kg |
| Internal length | 4.25m | 3.54 m (11 ft 7 in) |
| Internal width | 1.74m | 1.80 m (5 ft 11 in) |
| Gross weight | 3500kg | - |
| Payload | 2210kg | - |
| Maximum gross weight | - | 3200 kg |
| Overall length | - | 5.00 m (16 ft 5 in) |
Sources: Ifor Williams HB510XL, Richardson Trailers Supreme Ultra. 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 71cm (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 Supreme Ultra if...
- you want one that is 190kg lighter empty
- you want one that is 6cm wider inside
The Supreme Ultra suits owners looking for a well-established British-built two-horse trailer able to carry a pair of taller horses, since sellers describe it as taking two horses up to about 17.2hh. As a long-running Richardson model it is more often found on the used market now than ordered new.
Listed by
- Horse Trailer Sales - Robertsbridge, Staplecross
Common questions
What is the difference between the Ifor Williams HB510XL and the Richardson Trailers Supreme Ultra?
The Ifor Williams HB510XL is 71cm (2.5ft) longer inside. The Richardson Trailers Supreme Ultra is 190kg lighter empty and is 6cm wider inside. The Ifor Williams HB510XL is a an extra-length double horsebox trailer; the Richardson Trailers Supreme Ultra is a a two-horse trailer from British manufacturer Richardson, part of its Supreme range of horse trailers..
Which is lighter, the Ifor Williams HB510XL or the Richardson Trailers Supreme Ultra?
The Richardson Trailers Supreme Ultra. It is 190kg lighter empty than the Ifor Williams HB510XL.
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