Head to head
Equi-Trek Sonic Five Seats 3,500kg vs Ifor Williams GD105
The Ifor Williams GD105 is 1,915kg lighter empty. The Equi-Trek Sonic Five Seats 3,500kg is rated 800kg heavier gross.
Last reviewed 13 September 2026
Key differences
- Unladen weight: the Equi-Trek Sonic Five Seats 3,500kg weighs 1,915kg more empty.
- Gross weight: the Equi-Trek Sonic Five Seats 3,500kg is rated 800kg heavier gross.
Specifications side by side
| Equi-Trek Sonic Five Seats 3,500kg | Ifor Williams GD105 | |
|---|---|---|
| Gross weight | 3500kg | 2,700kg |
| Unladen weight | 2500kg | 585kg |
| Internal bed | - | 3.11m x 1.58m (10ft 2in x 5ft 2in) |
| Brakes | - | Braked |
Sources: Equi-Trek Sonic Five Seats 3,500kg, Ifor Williams GD105. 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...
- you want one that is rated 800kg heavier gross
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 GD105 if...
- you want one that is 1,915kg lighter empty
The same market as the GD85 with about 60cm more bed length, which is the difference between fitting a load and not. Landscapers and anyone moving long materials or a quad choose it for the length rather than the payload, which is unchanged.
Listed by
- Blendworth Trailers - Rowland's Castle
- Barnwell Trailers Ltd - Peterborough, Oundle, Barnwell
Common questions
What is the difference between the Equi-Trek Sonic Five Seats 3,500kg and the Ifor Williams GD105?
The Ifor Williams GD105 is 1,915kg lighter empty. The Equi-Trek Sonic Five Seats 3,500kg is rated 800kg heavier gross. The Equi-Trek Sonic Five Seats 3,500kg is a 5-seat version of the Sonic motorised horsebox; the Ifor Williams GD105 is a general duty box trailer, twin axle, longer bed.
Which is lighter, the Equi-Trek Sonic Five Seats 3,500kg or the Ifor Williams GD105?
The Ifor Williams GD105. It is 1,915kg 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 GD105 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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