Head to head
Bockmann Grand Master SR vs Equi-Trek Sonic Five Seats 3,500kg
The Equi-Trek Sonic Five Seats 3,500kg is rated 800kg heavier gross.
Last reviewed 13 September 2026
Key differences
- Gross weight: the Equi-Trek Sonic Five Seats 3,500kg is rated 800kg heavier gross.
Specifications side by side
| Bockmann Grand Master SR | Equi-Trek Sonic Five Seats 3,500kg | |
|---|---|---|
| Gross weight | 2700kg | 3500kg |
| Payload | 1462kg | - |
| Internal length | 3900mm | - |
| Internal width | 1750mm | - |
| Internal height | 2300mm | - |
| Unladen weight | - | 2500kg |
Sources: Bockmann Grand Master SR, 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 Grand Master SR if...
The top trim of the Master line, with a walk-in tack room and centre-post partition for owners who want more storage and easier loading than the basic Master. Suits liveries and competition riders travelling one or two larger horses.
Listed by
- Böckmann UK Trailers & Horseboxes - Cinderford, Littledean
Buy or hire the Sonic Five Seats 3,500kg if...
- you want one that is rated 800kg 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 Bockmann Grand Master SR and the Equi-Trek Sonic Five Seats 3,500kg?
The Equi-Trek Sonic Five Seats 3,500kg is rated 800kg heavier gross. The Bockmann Grand Master SR is a larger polyester 2-horse trailer with walk-in tack room; the Equi-Trek Sonic Five Seats 3,500kg is a 5-seat version of the Sonic motorised horsebox.
Can I tow the Bockmann Grand Master SR 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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