Head to head
Equi-Trek Sonic Five Seats 3,500kg vs Ifor Williams GX125 HD
The Ifor Williams GX125 HD is 1,740kg lighter empty.
Last reviewed 13 September 2026
Key differences
- Unladen weight: the Equi-Trek Sonic Five Seats 3,500kg weighs 1,740kg more empty.
Specifications side by side
| Equi-Trek Sonic Five Seats 3,500kg | Ifor Williams GX125 HD | |
|---|---|---|
| Gross weight | 3500kg | 3500kg |
| Unladen weight | 2500kg | 760kg |
| Payload | - | 2740kg |
| Internal bed | - | 3.66m x 1.57m |
Sources: Equi-Trek Sonic Five Seats 3,500kg, Ifor Williams GX125 HD. Figures vary by model year and options, so check with the supplier before you commit.
Buy or hire the Sonic Five Seats 3,500kg if...
A five-seat cab variant of the Sonic, aimed at families or small teams who want to travel together to competitions rather than sending a second car. It carries the same horse capacity as the standard Sonic.
Listed by
- Trek-Trailers Lincolnshire - Doncaster, Belton
- Trek-Trailers Three Counties - Hereford
Buy or hire the GX125 HD if...
- you want one that is 1,740kg lighter empty
For plant hire firms carrying longer machines such as excavators with extended dipper arms or tracked dumpers that need the extra bed length over the GX105HD.
Listed by
- Blains Trailers & Tyres - Hemel Hempstead, Great Gaddesden
Common questions
What is the difference between the Equi-Trek Sonic Five Seats 3,500kg and the Ifor Williams GX125 HD?
The Ifor Williams GX125 HD is 1,740kg lighter empty. The Equi-Trek Sonic Five Seats 3,500kg is a 5-seat version of the Sonic motorised horsebox; the Ifor Williams GX125 HD is a a longer heavy-duty plant trailer.
Which is lighter, the Equi-Trek Sonic Five Seats 3,500kg or the Ifor Williams GX125 HD?
The Ifor Williams GX125 HD. It is 1,740kg lighter empty than the Equi-Trek Sonic Five Seats 3,500kg.
Can I tow the Equi-Trek Sonic Five Seats 3,500kg or the Ifor Williams GX125 HD 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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