Head to head
Equi-Trek Sonic Five Seats 3,500kg vs Ifor Williams P5
The Ifor Williams P5 is 2,359kg lighter empty. The Equi-Trek Sonic Five Seats 3,500kg is rated 3 tonnes heavier gross.
Last reviewed 13 September 2026
Key differences
- Unladen weight: the Equi-Trek Sonic Five Seats 3,500kg weighs 2,359kg more empty.
- Gross weight: the Equi-Trek Sonic Five Seats 3,500kg is rated 3 tonnes heavier gross.
Specifications side by side
| Equi-Trek Sonic Five Seats 3,500kg | Ifor Williams P5 | |
|---|---|---|
| Gross weight | 3500kg | 500kg |
| Unladen weight | 2500kg | 141kg |
| Payload | - | 359kg |
| Internal bed | - | 1.53m x 1.02m |
| Brakes | - | Unbraked |
Sources: Equi-Trek Sonic Five Seats 3,500kg, Ifor Williams P5. 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 3 tonnes 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.
Full Sonic Five Seats 3,500kg specifications →Buy or hire the P5 if...
- you want one that is 2,359kg lighter empty
A light general-purpose trailer for domestic buyers moving garden waste, small loads or a mower, chosen for its low unladen weight so it can be towed by almost any car.
Full P5 specifications →Common questions
What is the difference between the Equi-Trek Sonic Five Seats 3,500kg and the Ifor Williams P5?
The Ifor Williams P5 is 2,359kg lighter empty. The Equi-Trek Sonic Five Seats 3,500kg is rated 3 tonnes heavier gross. The Equi-Trek Sonic Five Seats 3,500kg is a 5-seat version of the Sonic motorised horsebox; the Ifor Williams P5 is a the smallest unbraked domestic trailer Ifor Williams makes.
Which is lighter, the Equi-Trek Sonic Five Seats 3,500kg or the Ifor Williams P5?
The Ifor Williams P5. It is 2,359kg 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 P5 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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