Head to head
Ifor Williams Business Inabox vs Richardson Trailers Supreme Ultra
The Richardson Trailers Supreme Ultra is 800kg lighter empty. The Ifor Williams Business Inabox is 91cm (3ft) longer inside and is 38cm (1ft) wider inside.
Last reviewed 13 September 2026
Key differences
- Unladen weight: the Ifor Williams Business Inabox weighs 800kg more empty.
- Internal length: the Ifor Williams Business Inabox is 91cm (3ft) longer inside.
- Internal width: the Ifor Williams Business Inabox is 38cm (1ft) wider inside.
Specifications side by side
| Ifor Williams Business Inabox | Richardson Trailers Supreme Ultra | |
|---|---|---|
| Unladen weight | 1900kg (Workshop M) | 1100 kg |
| Internal length | 4.45m (Workshop M) | 3.54 m (11 ft 7 in) |
| Internal width | 2.18m | 1.80 m (5 ft 11 in) |
| Overall length | 5.96m (Workshop M) | 5.00 m (16 ft 5 in) |
| Gross weight | 3500kg | - |
| Maximum gross weight | - | 3200 kg |
Sources: Ifor Williams Business Inabox, Richardson Trailers Supreme Ultra. 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 91cm (3ft) longer inside
- you want one that is 38cm (1ft) 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 Supreme Ultra if...
- you want one that is 800kg lighter empty
The Supreme Ultra suits owners looking for a well-established British-built two-horse trailer able to carry a pair of taller horses, since sellers describe it as taking two horses up to about 17.2hh. As a long-running Richardson model it is more often found on the used market now than ordered new.
Listed by
- Horse Trailer Sales - Robertsbridge, Staplecross
Common questions
What is the difference between the Ifor Williams Business Inabox and the Richardson Trailers Supreme Ultra?
The Richardson Trailers Supreme Ultra is 800kg lighter empty. The Ifor Williams Business Inabox is 91cm (3ft) longer inside and is 38cm (1ft) wider inside. The Ifor Williams Business Inabox is a trailer-based mobile workshop, boxvan or catering/retail unit; the Richardson Trailers Supreme Ultra is a a two-horse trailer from British manufacturer Richardson, part of its Supreme range of horse trailers..
Which is lighter, the Ifor Williams Business Inabox or the Richardson Trailers Supreme Ultra?
The Richardson Trailers Supreme Ultra. It is 800kg lighter empty than the Ifor Williams Business Inabox.
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