Head to head
Brian James Race Box vs Richardson Trailers Supreme Ultra
The Brian James Race Box is 46cm (1.5ft) longer inside and is 15cm wider inside.
Last reviewed 13 September 2026
Key differences
- Internal length: the Brian James Race Box is 46cm (1.5ft) longer inside.
- Internal width: the Brian James Race Box is 15cm wider inside.
Specifications side by side
| Brian James Race Box | Richardson Trailers Supreme Ultra | |
|---|---|---|
| Internal width | 1.95m | 1.80 m (5 ft 11 in) |
| Internal length | 4.0m / 4.5m / 5.0m | 3.54 m (11 ft 7 in) |
| Gross weight | 3000kg | - |
| Payload | up to 1885kg | - |
| Axles | Twin | - |
| Maximum gross weight | - | 3200 kg |
| Unladen weight | - | 1100 kg |
| Overall length | - | 5.00 m (16 ft 5 in) |
Sources: Brian James Race Box, Richardson Trailers Supreme Ultra. 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 46cm (1.5ft) longer inside
- you want one that is 15cm 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 Supreme Ultra if...
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 Brian James Race Box and the Richardson Trailers Supreme Ultra?
The Brian James Race Box is 46cm (1.5ft) longer inside and is 15cm wider inside. The Brian James Race Box is a a fully enclosed twin-axle car transporter for classics and small race cars; the Richardson Trailers Supreme Ultra is a a two-horse trailer from British manufacturer Richardson, part of its Supreme range of horse trailers..
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