Head to head
Equi-Trek Sonic 3,500kg vs Ifor Williams HB506
The Ifor Williams HB506 is 1.4 tonnes lighter empty. The Equi-Trek Sonic 3,500kg is rated 900kg heavier gross.
Last reviewed 13 September 2026
Key differences
- Unladen weight: the Equi-Trek Sonic 3,500kg weighs 1.4 tonnes more empty.
- Gross weight: the Equi-Trek Sonic 3,500kg is rated 900kg heavier gross.
Specifications side by side
| Equi-Trek Sonic 3,500kg | Ifor Williams HB506 | |
|---|---|---|
| Gross weight | 3500kg | 2,600kg |
| Unladen weight | 2320kg | 920kg |
| Internal length | - | 3.16m |
| Internal width | - | 1.67m |
| Brakes | - | Braked |
Sources: Equi-Trek Sonic 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 3,500kg if...
- you want one that is rated 900kg heavier gross
A compact motorised horsebox pitched as easy to drive day to day, for owners of one or two horses who want a small horsebox rather than a trailer and tow car. It is one of Equi-Trek's lower-cost motorised models.
Listed by
- Trek-Trailers Lincolnshire - Doncaster, Belton
- Trek-Trailers Suffolk - Bury Saint Edmunds
- Trek-Trailers Three Counties - Hereford
Buy or hire the HB506 if...
- you want one that is 1.4 tonnes 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 3,500kg and the Ifor Williams HB506?
The Ifor Williams HB506 is 1.4 tonnes lighter empty. The Equi-Trek Sonic 3,500kg is rated 900kg heavier gross. The Equi-Trek Sonic 3,500kg is a compact 3.5 tonne motorised 2-horse horsebox; the Ifor Williams HB506 is a two-horse trailer, twin axle.
Which is lighter, the Equi-Trek Sonic 3,500kg or the Ifor Williams HB506?
The Ifor Williams HB506. It is 1.4 tonnes lighter empty than the Equi-Trek Sonic 3,500kg.
Can I tow the Equi-Trek Sonic 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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