Head to head
Bockmann Portax L K vs Stewart GX 18-23 S
The Stewart GX 18-23 S is rated 17.5 tonnes heavier gross.
Last reviewed 13 September 2026
Key differences
- Gross weight: the Stewart GX 18-23 S is rated 17.5 tonnes heavier gross.
Specifications side by side
| Bockmann Portax L K | Stewart GX 18-23 S | |
|---|---|---|
| Gross weight | 2500kg | 20,000kg |
| Payload | 1318kg | - |
| Internal length | 4125mm | - |
| Internal width | 1750mm | - |
| Internal height | 2300mm | - |
| Body size | - | 6,700 x 2,450 x 1,500mm |
| Cubic capacity | - | 23m3 grain, 39m3 silage |
| Tare weight | - | 5,900kg |
| Axles | - | 125mm dia., 10-stud, 420x180mm brakes |
Sources: Bockmann Portax L K, Stewart GX 18-23 S. Figures vary by model year and options, so check with the supplier before you commit.
Buy or hire the Portax L K if...
The longer 'L' version of the Portax K, giving taller or bigger horses more room while keeping the front-exit layout. It appeals to owners of warmbloods or cobs who found the standard Portax K too tight.
Listed by
- Böckmann UK Trailers & Horseboxes - Cinderford, Littledean
Buy or hire the GX 18-23 S if...
- you want one that is rated 17.5 tonnes heavier gross
An 18-23 tonne tipping trailer built for grain and silage haulage, with an easy-sheet system so one person can cover a loaded trailer without climbing on top. Its monocoque steel body gives it the extra capacity over Stewart's standard flat trailers.
Listed by
- Rising Sun Trailer Hire - York
Common questions
What is the difference between the Bockmann Portax L K and the Stewart GX 18-23 S?
The Stewart GX 18-23 S is rated 17.5 tonnes heavier gross. The Bockmann Portax L K is a long-wheelbase aluminium 2-horse trailer with front exit; the Stewart GX 18-23 S is a twin-axle tipping grain and silage trailer with an easy-sheet cover system.
Can I tow the Bockmann Portax L K or the Stewart GX 18-23 S on a car licence?
Stewart GX 18-23 S is rated over 3,500kg gross, which is beyond what a car can tow in the UK.
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