Head to head
Brian James C4 Blue vs Ifor Williams Business Inabox
The Brian James C4 Blue is 1,205kg lighter empty. The Ifor Williams Business Inabox is rated 900kg heavier gross.
Last reviewed 13 September 2026
Key differences
- Unladen weight: the Ifor Williams Business Inabox weighs 1,205kg more empty.
- Gross weight: the Ifor Williams Business Inabox is rated 900kg heavier gross.
Specifications side by side
| Brian James C4 Blue | Ifor Williams Business Inabox | |
|---|---|---|
| Gross weight | 2,600kg | 3500kg |
| Unladen weight | 695kg | 1900kg (Workshop M) |
| Bed length | 5.0m | - |
| Bed width | 2.0m | - |
| Internal length | - | 4.45m (Workshop M) |
| Internal width | - | 2.18m |
| Overall length | - | 5.96m (Workshop M) |
Sources: Brian James C4 Blue, Ifor Williams Business Inabox. Figures vary by model year and options, so check with the supplier before you commit.
Buy or hire the C4 Blue if...
- you want one that is 1,205kg lighter empty
A twin-axle open car transporter built to carry one road or track car behind a family car or 4x4. Track-day drivers and small vehicle traders hire it for moving a single car without the cost of an enclosed trailer.
Full C4 Blue specifications →Buy or hire the Business Inabox if...
- you want one that is rated 900kg heavier gross
A trailer shell fitted out as a mobile workshop, shop or catering unit rather than a load carrier. Tradespeople and mobile caterers buy it to take a fitted-out workspace to a site rather than build one into a van.
Listed by
- Norfolk Trailers - Norwich
Common questions
What is the difference between the Brian James C4 Blue and the Ifor Williams Business Inabox?
The Brian James C4 Blue is 1,205kg lighter empty. The Ifor Williams Business Inabox is rated 900kg heavier gross. The Brian James C4 Blue is a twin-axle car transporter trailer; the Ifor Williams Business Inabox is a trailer-based mobile workshop, boxvan or catering/retail unit.
Which is lighter, the Brian James C4 Blue or the Ifor Williams Business Inabox?
The Brian James C4 Blue. It is 1,205kg lighter empty than the Ifor Williams Business Inabox.
Can I tow the Brian James C4 Blue or the Ifor Williams Business Inabox 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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