Head to head
Equi-Trek Sonic Five Seats 3,500kg vs Humbaur Steely
The Equi-Trek Sonic Five Seats 3,500kg is rated 2,750kg heavier gross.
Last reviewed 13 September 2026
Key differences
- Gross weight: the Equi-Trek Sonic Five Seats 3,500kg is rated 2,750kg heavier gross.
Specifications side by side
| Equi-Trek Sonic Five Seats 3,500kg | Humbaur Steely | |
|---|---|---|
| Gross weight | 3500kg | 750kg |
| Unladen weight | 2500kg | - |
| Payload | - | 630kg |
| Inner length | - | 2050mm |
| Inner width | - | 1095mm |
Sources: Equi-Trek Sonic Five Seats 3,500kg, Humbaur Steely. 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...
- you want one that is rated 2,750kg 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
Buy or hire the Steely if...
The Steely is Humbaur's budget single-axle trailer, built with a hot-dip galvanised chassis as what the manufacturer describes as an entry point into trailer ownership. It suits light garden, construction-site and hobby loads rather than heavier trade use.
Full Steely specifications →Common questions
What is the difference between the Equi-Trek Sonic Five Seats 3,500kg and the Humbaur Steely?
The Equi-Trek Sonic Five Seats 3,500kg is rated 2,750kg heavier gross. The Equi-Trek Sonic Five Seats 3,500kg is a 5-seat version of the Sonic motorised horsebox; the Humbaur Steely is a a small, unbraked single-axle flatbed trailer aimed at first-time buyers and light garden/site use..
Can I tow the Equi-Trek Sonic Five Seats 3,500kg or the Humbaur Steely 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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