Head to head
Ifor Williams Business Inabox vs Ifor Williams HB403
The Ifor Williams HB403 is 1,133kg lighter empty. The Ifor Williams Business Inabox is rated 1.9 tonnes heavier gross and is 88cm (3ft) wider inside.
Last reviewed 13 September 2026
Key differences
- Unladen weight: the Ifor Williams Business Inabox weighs 1,133kg more empty.
- Gross weight: the Ifor Williams Business Inabox is rated 1.9 tonnes heavier gross.
- Internal width: the Ifor Williams Business Inabox is 88cm (3ft) wider inside.
- Internal length: the Ifor Williams Business Inabox is 1.37m (4.5ft) longer inside.
Specifications side by side
| Ifor Williams Business Inabox | Ifor Williams HB403 | |
|---|---|---|
| Gross weight | 3500kg | 1600kg |
| Unladen weight | 1900kg (Workshop M) | 767kg |
| Internal length | 4.45m (Workshop M) | 3.08m |
| Internal width | 2.18m | 1.30m |
| Overall length | 5.96m (Workshop M) | - |
| Payload | - | 833kg |
Sources: Ifor Williams Business Inabox, Ifor Williams HB403. Figures vary by model year and options, so check with the supplier before you commit.
Buy or hire the Business Inabox if...
- you want one that is rated 1.9 tonnes heavier gross
- you want one that is 88cm (3ft) wider inside
- you want one that is 1.37m (4.5ft) longer inside
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
Buy or hire the HB403 if...
- you want one that is 1,133kg lighter empty
The smallest trailer in the HB horsebox range, bought by owners of a single horse or a couple of ponies who want the lightest legal option that can still be towed by a mid-size car.
Listed by
- Horse Trailer Sales - Robertsbridge, Staplecross
- Barnwell Trailers Ltd - Peterborough, Oundle, Barnwell
Common questions
What is the difference between the Ifor Williams Business Inabox and the Ifor Williams HB403?
The Ifor Williams HB403 is 1,133kg lighter empty. The Ifor Williams Business Inabox is rated 1.9 tonnes heavier gross and is 88cm (3ft) wider inside. The Ifor Williams Business Inabox is a trailer-based mobile workshop, boxvan or catering/retail unit; the Ifor Williams HB403 is a a compact single-horse or two-pony horsebox trailer.
Which is lighter, the Ifor Williams Business Inabox or the Ifor Williams HB403?
The Ifor Williams HB403. It is 1,133kg lighter empty than the Ifor Williams Business Inabox.
Can I tow the Ifor Williams Business Inabox or the Ifor Williams HB403 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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