Head to head
Brian James Race Box vs Ifor Williams HB506
The Brian James Race Box is 84cm (3ft) longer inside and is 28cm wider inside.
Last reviewed 13 September 2026
Key differences
- Internal length: the Brian James Race Box is 84cm (3ft) longer inside.
- Internal width: the Brian James Race Box is 28cm wider inside.
- Gross weight: the Brian James Race Box is rated 400kg heavier gross.
Specifications side by side
| Brian James Race Box | Ifor Williams HB506 | |
|---|---|---|
| Gross weight | 3000kg | 2,600kg |
| Internal width | 1.95m | 1.67m |
| Internal length | 4.0m / 4.5m / 5.0m | 3.16m |
| Payload | up to 1885kg | - |
| Axles | Twin | - |
| Unladen weight | - | 920kg |
| Brakes | - | Braked |
Sources: Brian James Race Box, Ifor Williams HB506. 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 84cm (3ft) longer inside
- you want one that is 28cm wider inside
- you want one that is rated 400kg heavier gross
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 HB506 if...
The mainstream two-horse trailer in Britain, used by private owners and small yards. Its comparatively low unladen weight for the class is the practical point: it widens the range of 4x4s and large SUVs that can legally and comfortably tow it.
Listed by
- R M Trailer Centre - Middlesbrough, North Ormesby
- Blains Trailers & Tyres - Hemel Hempstead, Great Gaddesden
- Horse Trailer Sales - Robertsbridge, Staplecross
- Barnwell Trailers Ltd - Peterborough, Oundle, Barnwell
Common questions
What is the difference between the Brian James Race Box and the Ifor Williams HB506?
The Brian James Race Box is 84cm (3ft) longer inside and is 28cm 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 HB506 is a two-horse trailer, twin axle.
Can I tow the Brian James Race Box or the Ifor Williams HB506 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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