Head to head
Equi-Trek Sonic Five Seats 3,500kg vs Ifor Williams HBX506
The Ifor Williams HBX506 is 1,635kg 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 1,635kg 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 HBX506 | |
|---|---|---|
| Gross weight | 3500kg | 2600kg |
| Unladen weight | 2500kg | 865kg |
| Payload | - | 1735kg |
| Internal length | - | 3.26m |
| Internal width | - | 1.67m |
Sources: Equi-Trek Sonic Five Seats 3,500kg, Ifor Williams HBX506. 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 HBX506 if...
- you want one that is 1,635kg lighter empty
A mid-size horsebox for owners moving one or two horses who want the updated HBX styling and features rather than the standard HB range trailer.
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 HBX506?
The Ifor Williams HBX506 is 1,635kg 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 HBX506 is a a double horsebox trailer from Ifor Williams' HBX range.
Which is lighter, the Equi-Trek Sonic Five Seats 3,500kg or the Ifor Williams HBX506?
The Ifor Williams HBX506. It is 1,635kg 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 HBX506 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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