Head to head
Brian James Race Box vs Ifor Williams LM146
The Ifor Williams LM146 carries 880kg more and is rated 500kg heavier gross.
Last reviewed 13 September 2026
Key differences
- Payload: the Ifor Williams LM146 carries 880kg more.
- Gross weight: the Ifor Williams LM146 is rated 500kg heavier gross.
Specifications side by side
| Brian James Race Box | Ifor Williams LM146 | |
|---|---|---|
| Gross weight | 3000kg | 3500kg |
| Payload | up to 1885kg | 2765kg |
| Internal width | 1.95m | - |
| Internal length | 4.0m / 4.5m / 5.0m | - |
| Axles | Twin | - |
| Overall length | - | 5.60m |
| Overall width | - | 2.10m |
| Bed | - | 4.23m / 13'9" ((internal) length); 1.98m / 6'5" ((internal) width) |
| Unladen weight | - | 735kg |
| Tyres | - | 195/60R12C |
Sources: Brian James Race Box, Ifor Williams LM146. Figures vary by model year and options, so check with the supplier before you commit.
Buy or hire the Race Box if...
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 LM146 if...
- you want one that carries 880kg more
- you want one that is rated 500kg heavier gross
The LM146 is a general-purpose flatbed aimed at landscaping, construction and plumbing trades that need a long, wide load bed with a high payload on a single 3500kg-braked chassis. It is used where loads are bulky or awkwardly shaped rather than plant machinery, which typically goes on the ramped GX range instead.
Listed by
- Blains Trailers & Tyres - Hemel Hempstead, Great Gaddesden
- G-Tec Trailers - Thetford, Holme Hale
- Barnwell Trailers Ltd - Peterborough, Oundle, Barnwell
Common questions
What is the difference between the Brian James Race Box and the Ifor Williams LM146?
The Ifor Williams LM146 carries 880kg more and is rated 500kg 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 LM146 is a a twin-axle flatbed goods trailer in the heavier-duty LM range..
Which carries more, the Brian James Race Box or the Ifor Williams LM146?
The Ifor Williams LM146, by 880kg.
Can I tow the Brian James Race Box or the Ifor Williams LM146 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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