Head to head
Equi-Trek Sonic 3,500kg vs Ifor Williams Business Inabox
The Ifor Williams Business Inabox is 420kg lighter empty.
Last reviewed 13 September 2026
Key differences
- Unladen weight: the Equi-Trek Sonic 3,500kg weighs 420kg more empty.
Specifications side by side
| Equi-Trek Sonic 3,500kg | Ifor Williams Business Inabox | |
|---|---|---|
| Gross weight | 3500kg | 3500kg |
| Unladen weight | 2320kg | 1900kg (Workshop M) |
| Internal length | - | 4.45m (Workshop M) |
| Internal width | - | 2.18m |
| Overall length | - | 5.96m (Workshop M) |
Sources: Equi-Trek Sonic 3,500kg, Ifor Williams Business Inabox. Figures vary by model year and options, so check with the supplier before you commit.
Buy or hire the Sonic 3,500kg if...
A compact motorised horsebox pitched as easy to drive day to day, for owners of one or two horses who want a small horsebox rather than a trailer and tow car. It is one of Equi-Trek's lower-cost motorised models.
Listed by
- Trek-Trailers Lincolnshire - Doncaster, Belton
- Trek-Trailers Suffolk - Bury Saint Edmunds
- Trek-Trailers Three Counties - Hereford
Buy or hire the Business Inabox if...
- you want one that is 420kg lighter empty
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 Equi-Trek Sonic 3,500kg and the Ifor Williams Business Inabox?
The Ifor Williams Business Inabox is 420kg lighter empty. The Equi-Trek Sonic 3,500kg is a compact 3.5 tonne motorised 2-horse horsebox; the Ifor Williams Business Inabox is a trailer-based mobile workshop, boxvan or catering/retail unit.
Which is lighter, the Equi-Trek Sonic 3,500kg or the Ifor Williams Business Inabox?
The Ifor Williams Business Inabox. It is 420kg lighter empty than the Equi-Trek Sonic 3,500kg.
Can I tow the Equi-Trek Sonic 3,500kg 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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