Head to head
Equi-Trek Sonic 3,500kg vs Ifor Williams GD85
The Ifor Williams GD85 is 1,925kg lighter empty. The Equi-Trek Sonic 3,500kg is rated 2.1 tonnes heavier gross.
Last reviewed 13 September 2026
Key differences
- Unladen weight: the Equi-Trek Sonic 3,500kg weighs 1,925kg more empty.
- Gross weight: the Equi-Trek Sonic 3,500kg is rated 2.1 tonnes heavier gross.
Specifications side by side
| Equi-Trek Sonic 3,500kg | Ifor Williams GD85 | |
|---|---|---|
| Gross weight | 3500kg | 1,400kg single axle / 2,700kg twin axle |
| Unladen weight | 2320kg | 395kg single axle / 485kg twin axle |
| Internal bed | - | 2.5m x 1.58m (8ft 2in x 5ft 2in) |
| Brakes | - | Braked, auto-reverse over-run |
Sources: Equi-Trek Sonic 3,500kg, Ifor Williams GD85. Figures vary by model year and options, so check with the supplier before you commit.
Buy or hire the Sonic 3,500kg if...
- you want one that is rated 2.1 tonnes heavier gross
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 GD85 if...
- you want one that is 1,925kg lighter empty
The entry point of the Ifor Williams general duty range and one of the most common working trailers in Britain. Smallholders, gardeners and tradespeople buy it for everyday hauling without needing a heavy tow vehicle, and the twin-axle version roughly doubles the payload for a modest gain in unladen weight.
Full GD85 specifications →Common questions
What is the difference between the Equi-Trek Sonic 3,500kg and the Ifor Williams GD85?
The Ifor Williams GD85 is 1,925kg lighter empty. The Equi-Trek Sonic 3,500kg is rated 2.1 tonnes heavier gross. The Equi-Trek Sonic 3,500kg is a compact 3.5 tonne motorised 2-horse horsebox; the Ifor Williams GD85 is a general duty box trailer, single or twin axle.
Which is lighter, the Equi-Trek Sonic 3,500kg or the Ifor Williams GD85?
The Ifor Williams GD85. It is 1,925kg lighter empty than the Equi-Trek Sonic 3,500kg.
Can I tow the Equi-Trek Sonic 3,500kg or the Ifor Williams GD85 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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