Head to head
Brian James A Transporter (A4) vs Equi-Trek Sonic Five Seats 3,500kg
The Equi-Trek Sonic Five Seats 3,500kg is rated 1.5 tonnes heavier gross.
Last reviewed 13 September 2026
Key differences
- Gross weight: the Equi-Trek Sonic Five Seats 3,500kg is rated 1.5 tonnes heavier gross.
Specifications side by side
| Brian James A Transporter (A4) | Equi-Trek Sonic Five Seats 3,500kg | |
|---|---|---|
| Gross weight | 2,000kg to 3,000kg depending on variant | 3500kg |
| Bed | 3.7m x 1.8m up to 5.0m x 2.0m depending on variant | - |
| Brakes | Braked, tandem axle | - |
| Unladen weight | - | 2500kg |
Sources: Brian James A Transporter (A4), 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 A Transporter (A4) if...
One of the most common car trailers in Britain, bought by trade and private owners for moving road cars, project cars and small vans. The reason it sells is the spread of bed length and gross weight combinations, which lets you match the trailer to the tow car rather than the other way round.
Listed by
- Fieldfare Trailer Centre - Salisbury
- Trek-Trailers Three Counties - Hereford
Buy or hire the Sonic Five Seats 3,500kg if...
- you want one that is rated 1.5 tonnes 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.
Full Sonic Five Seats 3,500kg specifications →Common questions
What is the difference between the Brian James A Transporter (A4) and the Equi-Trek Sonic Five Seats 3,500kg?
The Equi-Trek Sonic Five Seats 3,500kg is rated 1.5 tonnes heavier gross. The Brian James A Transporter (A4) is a open flatbed car transporter, twin axle; the Equi-Trek Sonic Five Seats 3,500kg is a 5-seat version of the Sonic motorised horsebox.
Can I tow the Brian James A Transporter (A4) 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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