Head to head
Equi-Trek Sonic Five Seats 3,500kg vs Ifor Williams CT166
The Ifor Williams CT166 is 1,615kg lighter empty.
Last reviewed 13 September 2026
Key differences
- Unladen weight: the Equi-Trek Sonic Five Seats 3,500kg weighs 1,615kg more empty.
Specifications side by side
| Equi-Trek Sonic Five Seats 3,500kg | Ifor Williams CT166 | |
|---|---|---|
| Gross weight | 3500kg | 3500kg |
| Unladen weight | 2500kg | 885kg |
| Payload | - | 2615kg |
| Internal bed | - | 4.87m x 1.90m |
Sources: Equi-Trek Sonic Five Seats 3,500kg, Ifor Williams CT166. 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...
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 CT166 if...
- you want one that is 1,615kg lighter empty
Bought by garages, recovery operators and plant hire firms who load low vehicles or compact machinery by tilting the deck to ground level instead of driving up loading ramps. The narrower CT166 bed suits standard cars and single machines.
Listed by
- Blains Trailers & Tyres - Hemel Hempstead, Great Gaddesden
Common questions
What is the difference between the Equi-Trek Sonic Five Seats 3,500kg and the Ifor Williams CT166?
The Ifor Williams CT166 is 1,615kg lighter empty. The Equi-Trek Sonic Five Seats 3,500kg is a 5-seat version of the Sonic motorised horsebox; the Ifor Williams CT166 is a a tilt-bed car and machinery transporter trailer.
Which is lighter, the Equi-Trek Sonic Five Seats 3,500kg or the Ifor Williams CT166?
The Ifor Williams CT166. It is 1,615kg 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 CT166 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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