Head to head
Brian James C4 vs Ifor Williams Business Inabox
The Ifor Williams Business Inabox is rated 900kg heavier gross.
Last reviewed 13 September 2026
Key differences
- Gross weight: the Ifor Williams Business Inabox is rated 900kg heavier gross.
Specifications side by side
| Brian James C4 | Ifor Williams Business Inabox | |
|---|---|---|
| Gross weight | 2600kg | 3500kg |
| Axles | Twin | - |
| Size | 2m x 4.5m loading area | - |
| Unladen weight | - | 1900kg (Workshop M) |
| Internal length | - | 4.45m (Workshop M) |
| Internal width | - | 2.18m |
| Overall length | - | 5.96m (Workshop M) |
Sources: Brian James C4, Ifor Williams Business Inabox. Figures vary by model year and options, so check with the supplier before you commit.
Buy or hire the C4 if...
Brian James C4, carried by UK dealers and hire companies listed on GetBrent for hire. Car transporters in this class are hired and bought by track-day drivers, classic car owners and recovery firms who need to move a vehicle without driving it.
Listed by
- R M Trailer Centre - Middlesbrough, North Ormesby
- Cobham Trailer Hire - Cobham, East Horsley
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 and the Ifor Williams Business Inabox?
The Ifor Williams Business Inabox is rated 900kg heavier gross. The Brian James C4 is a car transporter trailer; the Ifor Williams Business Inabox is a trailer-based mobile workshop, boxvan or catering/retail unit.
Can I tow the Brian James C4 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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