Head to head
Brian James Race Box vs Ifor Williams HB511
The Brian James Race Box is 48cm (1.5ft) longer inside and is rated 300kg heavier gross.
Last reviewed 13 September 2026
Key differences
- Internal length: the Brian James Race Box is 48cm (1.5ft) longer inside.
- Gross weight: the Brian James Race Box is rated 300kg heavier gross.
- Internal width: the Brian James Race Box is 16cm wider inside.
Specifications side by side
| Brian James Race Box | Ifor Williams HB511 | |
|---|---|---|
| Gross weight | 3000kg | 2,700kg |
| Internal width | 1.95m | 1.79m |
| Internal length | 4.0m / 4.5m / 5.0m | 3.52m |
| Payload | up to 1885kg | - |
| Axles | Twin | - |
| Unladen weight | - | 1,000kg |
| Brakes | - | Braked |
Sources: Brian James Race Box, Ifor Williams HB511. 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 48cm (1.5ft) longer inside
- you want one that is rated 300kg heavier gross
- you want one that is 16cm 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 HB511 if...
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 Brian James Race Box and the Ifor Williams HB511?
The Brian James Race Box is 48cm (1.5ft) longer inside and is rated 300kg heavier gross. The Brian James Race Box is a a fully enclosed twin-axle car transporter for classics and small race cars; the Ifor Williams HB511 is a two-horse trailer, twin axle, wider body.
Can I tow the Brian James Race Box 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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