Head to head
Equi-Trek Sonic Five Seats 3,500kg vs Ifor Williams HB403
The Ifor Williams HB403 is 1,733kg lighter empty. The Equi-Trek Sonic Five Seats 3,500kg is rated 1.9 tonnes heavier gross.
Last reviewed 13 September 2026
Key differences
- Unladen weight: the Equi-Trek Sonic Five Seats 3,500kg weighs 1,733kg more empty.
- Gross weight: the Equi-Trek Sonic Five Seats 3,500kg is rated 1.9 tonnes heavier gross.
Specifications side by side
| Equi-Trek Sonic Five Seats 3,500kg | Ifor Williams HB403 | |
|---|---|---|
| Gross weight | 3500kg | 1600kg |
| Unladen weight | 2500kg | 767kg |
| Payload | - | 833kg |
| Internal length | - | 3.08m |
| Internal width | - | 1.30m |
Sources: Equi-Trek Sonic Five Seats 3,500kg, Ifor Williams HB403. 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 1.9 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.
Listed by
- Trek-Trailers Lincolnshire - Doncaster, Belton
- Trek-Trailers Three Counties - Hereford
Buy or hire the HB403 if...
- you want one that is 1,733kg lighter empty
The smallest trailer in the HB horsebox range, bought by owners of a single horse or a couple of ponies who want the lightest legal option that can still be towed by a mid-size car.
Listed by
- Horse Trailer Sales - Robertsbridge, Staplecross
- 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 HB403?
The Ifor Williams HB403 is 1,733kg lighter empty. The Equi-Trek Sonic Five Seats 3,500kg is rated 1.9 tonnes heavier gross. The Equi-Trek Sonic Five Seats 3,500kg is a 5-seat version of the Sonic motorised horsebox; the Ifor Williams HB403 is a a compact single-horse or two-pony horsebox trailer.
Which is lighter, the Equi-Trek Sonic Five Seats 3,500kg or the Ifor Williams HB403?
The Ifor Williams HB403. It is 1,733kg 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 HB403 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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