Head to head
Brian James Race Box vs Ifor Williams HB510XL
The Ifor Williams HB510XL carries 325kg more and is rated 500kg heavier gross. The Brian James Race Box is 21cm wider inside.
Last reviewed 13 September 2026
Key differences
- Payload: the Ifor Williams HB510XL carries 325kg more.
- Gross weight: the Ifor Williams HB510XL is rated 500kg heavier gross.
- Internal width: the Brian James Race Box is 21cm wider inside.
- Internal length: the Ifor Williams HB510XL is 25cm longer inside.
Specifications side by side
| Brian James Race Box | Ifor Williams HB510XL | |
|---|---|---|
| Gross weight | 3000kg | 3500kg |
| Payload | up to 1885kg | 2210kg |
| Internal width | 1.95m | 1.74m |
| Internal length | 4.0m / 4.5m / 5.0m | 4.25m |
| Axles | Twin | - |
| Unladen weight | - | 1290kg |
Sources: Brian James Race Box, Ifor Williams HB510XL. Figures vary by model year and options, so check with the supplier before you commit.
Buy or hire the Race Box if...
- you want one that is 21cm wider inside
Positioned for classic car owners and smaller motorsport teams who want their car fully enclosed and weatherproof but do not need the wider bed of the Race Sport or Race Transporter ranges. The narrower internal width suits a single classic or compact race car rather than a modern GT car.
Listed by
- Formula Trailers,, Brian-James Trailers Main Dealer in the SW UK - Wellington, Poole
Buy or hire the HB510XL if...
- you want one that carries 325kg more
- you want one that is rated 500kg heavier gross
- you want one that is 25cm 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
Common questions
What is the difference between the Brian James Race Box and the Ifor Williams HB510XL?
The Ifor Williams HB510XL carries 325kg more and is rated 500kg heavier gross. The Brian James Race Box is 21cm wider inside. The Brian James Race Box is a a fully enclosed twin-axle car transporter for classics and small race cars; the Ifor Williams HB510XL is a an extra-length double horsebox trailer.
Which carries more, the Brian James Race Box or the Ifor Williams HB510XL?
The Ifor Williams HB510XL, by 325kg.
Can I tow the Brian James Race Box 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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