Head to head
Brian James A Transporter (A4) vs Ifor Williams Business Inabox
The Ifor Williams Business Inabox is rated 1.5 tonnes heavier gross.
Last reviewed 13 September 2026
Key differences
- Gross weight: the Ifor Williams Business Inabox is rated 1.5 tonnes heavier gross.
Specifications side by side
| Brian James A Transporter (A4) | Ifor Williams Business Inabox | |
|---|---|---|
| Gross weight | 2,000kg to 3,000kg depending on variant | 3500kg |
| Bed | 3.7m x 1.8m up to 5.0m x 2.0m depending on variant | - |
| Brakes | Braked, tandem axle | - |
| Unladen weight | - | 1900kg (Workshop M) |
| Internal length | - | 4.45m (Workshop M) |
| Internal width | - | 2.18m |
| Overall length | - | 5.96m (Workshop M) |
Sources: Brian James A Transporter (A4), Ifor Williams Business Inabox. Figures vary by model year and options, so check with the supplier before you commit.
Buy or hire the A Transporter (A4) if...
One of the most common car trailers in Britain, bought by trade and private owners for moving road cars, project cars and small vans. The reason it sells is the spread of bed length and gross weight combinations, which lets you match the trailer to the tow car rather than the other way round.
Listed by
- Fieldfare Trailer Centre - Salisbury
- Bicester Trailer Centre - Bicester
- Trek-Trailers Three Counties - Hereford
Buy or hire the Business Inabox if...
- you want one that is rated 1.5 tonnes 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 A Transporter (A4) and the Ifor Williams Business Inabox?
The Ifor Williams Business Inabox is rated 1.5 tonnes heavier gross. The Brian James A Transporter (A4) is a open flatbed car transporter, twin axle; the Ifor Williams Business Inabox is a trailer-based mobile workshop, boxvan or catering/retail unit.
Can I tow the Brian James A Transporter (A4) 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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