Head to head
Equi-Trek Sonic Five Seats 3,500kg vs Ifor Williams HB506
The Ifor Williams HB506 is 1,580kg lighter empty. The Equi-Trek Sonic Five Seats 3,500kg is rated 900kg heavier gross.
Last reviewed 13 September 2026
Key differences
- Unladen weight: the Equi-Trek Sonic Five Seats 3,500kg weighs 1,580kg more empty.
- Gross weight: the Equi-Trek Sonic Five Seats 3,500kg is rated 900kg heavier gross.
Specifications side by side
| Equi-Trek Sonic Five Seats 3,500kg | Ifor Williams HB506 | |
|---|---|---|
| Gross weight | 3500kg | 2,600kg |
| Unladen weight | 2500kg | 920kg |
| Internal length | - | 3.16m |
| Internal width | - | 1.67m |
| Brakes | - | Braked |
Sources: Equi-Trek Sonic Five Seats 3,500kg, Ifor Williams HB506. 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 900kg 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 HB506 if...
- you want one that is 1,580kg lighter empty
The mainstream two-horse trailer in Britain, used by private owners and small yards. Its comparatively low unladen weight for the class is the practical point: it widens the range of 4x4s and large SUVs that can legally and comfortably tow it.
Listed by
- R M Trailer Centre - Middlesbrough, North Ormesby
- Blains Trailers & Tyres - Hemel Hempstead, Great Gaddesden
- 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 HB506?
The Ifor Williams HB506 is 1,580kg lighter empty. The Equi-Trek Sonic Five Seats 3,500kg is rated 900kg heavier gross. The Equi-Trek Sonic Five Seats 3,500kg is a 5-seat version of the Sonic motorised horsebox; the Ifor Williams HB506 is a two-horse trailer, twin axle.
Which is lighter, the Equi-Trek Sonic Five Seats 3,500kg or the Ifor Williams HB506?
The Ifor Williams HB506. It is 1,580kg 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 HB506 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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