Head to head
Ifor Williams Business Inabox vs Ifor Williams HB511
The Ifor Williams HB511 is 900kg lighter empty. The Ifor Williams Business Inabox is rated 800kg heavier gross and is 93cm (3ft) longer inside.
Last reviewed 13 September 2026
Key differences
- Unladen weight: the Ifor Williams Business Inabox weighs 900kg more empty.
- Gross weight: the Ifor Williams Business Inabox is rated 800kg heavier gross.
- Internal length: the Ifor Williams Business Inabox is 93cm (3ft) longer inside.
- Internal width: the Ifor Williams Business Inabox is 39cm (1.5ft) wider inside.
Specifications side by side
| Ifor Williams Business Inabox | Ifor Williams HB511 | |
|---|---|---|
| Gross weight | 3500kg | 2,700kg |
| Unladen weight | 1900kg (Workshop M) | 1,000kg |
| Internal length | 4.45m (Workshop M) | 3.52m |
| Internal width | 2.18m | 1.79m |
| Overall length | 5.96m (Workshop M) | - |
| Brakes | - | Braked |
Sources: Ifor Williams Business Inabox, Ifor Williams HB511. 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 800kg heavier gross
- you want one that is 93cm (3ft) longer inside
- you want one that is 39cm (1.5ft) wider 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 HB511 if...
- you want one that is 900kg lighter empty
The wider step up from the HB506, for larger horses or owners who want more room in transit. The extra 12cm of internal width and 36cm of length cost 80kg unladen, which is worth checking against your tow vehicle before choosing it over the HB506.
Listed by
- Trek-Trailers Suffolk - Bury Saint Edmunds
- R M Trailer Centre - Middlesbrough, North Ormesby
- Blains Trailers & Tyres - Hemel Hempstead, Great Gaddesden
- Horse Trailer Sales - Robertsbridge, Staplecross
- Trek-Trailers Three Counties - Hereford
- Barnwell Trailers Ltd - Peterborough, Oundle, Barnwell
Common questions
What is the difference between the Ifor Williams Business Inabox and the Ifor Williams HB511?
The Ifor Williams HB511 is 900kg lighter empty. The Ifor Williams Business Inabox is rated 800kg heavier gross and is 93cm (3ft) longer inside. The Ifor Williams Business Inabox is a trailer-based mobile workshop, boxvan or catering/retail unit; the Ifor Williams HB511 is a two-horse trailer, twin axle, wider body.
Which is lighter, the Ifor Williams Business Inabox or the Ifor Williams HB511?
The Ifor Williams HB511. It is 900kg lighter empty than the Ifor Williams Business Inabox.
Can I tow the Ifor Williams Business Inabox or the Ifor Williams HB511 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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