Head to head
Brian James C4 Blue vs Equi-Trek Sonic Five Seats 3,500kg
The Brian James C4 Blue is 1,805kg 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 1,805kg more empty.
- Gross weight: the Equi-Trek Sonic Five Seats 3,500kg is rated 900kg heavier gross.
Specifications side by side
| Brian James C4 Blue | Equi-Trek Sonic Five Seats 3,500kg | |
|---|---|---|
| Gross weight | 2,600kg | 3500kg |
| Unladen weight | 695kg | 2500kg |
| Bed length | 5.0m | - |
| Bed width | 2.0m | - |
Sources: Brian James C4 Blue, Equi-Trek Sonic Five Seats 3,500kg. Figures vary by model year and options, so check with the supplier before you commit.
Buy or hire the C4 Blue if...
- you want one that is 1,805kg lighter empty
A twin-axle open car transporter built to carry one road or track car behind a family car or 4x4. Track-day drivers and small vehicle traders hire it for moving a single car without the cost of an enclosed trailer.
Full C4 Blue specifications →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
Common questions
What is the difference between the Brian James C4 Blue and the Equi-Trek Sonic Five Seats 3,500kg?
The Brian James C4 Blue is 1,805kg lighter empty. The Equi-Trek Sonic Five Seats 3,500kg is rated 900kg heavier gross. The Brian James C4 Blue is a twin-axle car transporter trailer; the Equi-Trek Sonic Five Seats 3,500kg is a 5-seat version of the Sonic motorised horsebox.
Which is lighter, the Brian James C4 Blue or the Equi-Trek Sonic Five Seats 3,500kg?
The Brian James C4 Blue. It is 1,805kg lighter empty than the Equi-Trek Sonic Five Seats 3,500kg.
Can I tow the Brian James C4 Blue or the Equi-Trek Sonic Five Seats 3,500kg 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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