Head to head
Equi-Trek Sonic Five Seats 3,500kg vs Ifor Williams GP
The Equi-Trek Sonic Five Seats 3,500kg is a 5-seat version of the sonic motorised horsebox. The Ifor Williams GP is a plant trailer range.
Last reviewed 13 September 2026
Specifications side by side
| Equi-Trek Sonic Five Seats 3,500kg | Ifor Williams GP | |
|---|---|---|
| Gross weight | 3500kg | 3500kg |
| Unladen weight | 2500kg | - |
| Axles | - | Tri-axle |
Sources: Equi-Trek Sonic Five Seats 3,500kg, Ifor Williams GP. 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 GP if...
Ifor Williams GP, carried by UK dealers and hire companies listed on GetBrent for sale. Plant trailers are the working end of groundworks: contractors and hire firms use them to move mini diggers, dumpers and rollers between sites.
Listed by
- R M Trailer Centre - Middlesbrough, North Ormesby
- 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 GP?
The Equi-Trek Sonic Five Seats 3,500kg is a 5-seat version of the Sonic motorised horsebox; the Ifor Williams GP is a plant trailer range.
Can I tow the Equi-Trek Sonic Five Seats 3,500kg or the Ifor Williams GP 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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