Head to head
Ifor Williams HB403 vs Stewart GX 18-23 S
The Stewart GX 18-23 S is rated 18.4 tonnes heavier gross.
Last reviewed 13 September 2026
Key differences
- Gross weight: the Stewart GX 18-23 S is rated 18.4 tonnes heavier gross.
Specifications side by side
| Ifor Williams HB403 | Stewart GX 18-23 S | |
|---|---|---|
| Gross weight | 1600kg | 20,000kg |
| Unladen weight | 767kg | - |
| Payload | 833kg | - |
| Internal length | 3.08m | - |
| Internal width | 1.30m | - |
| 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: Ifor Williams HB403, Stewart GX 18-23 S. Figures vary by model year and options, so check with the supplier before you commit.
Buy or hire the HB403 if...
The smallest trailer in the HB horsebox range, bought by owners of a single horse or a couple of ponies who want the lightest legal option that can still be towed by a mid-size car.
Listed by
- Horse Trailer Sales - Robertsbridge, Staplecross
- Barnwell Trailers Ltd - Peterborough, Oundle, Barnwell
Buy or hire the GX 18-23 S if...
- you want one that is rated 18.4 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 Ifor Williams HB403 and the Stewart GX 18-23 S?
The Stewart GX 18-23 S is rated 18.4 tonnes heavier gross. The Ifor Williams HB403 is a a compact single-horse or two-pony horsebox trailer; 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 Ifor Williams HB403 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.
GetBrent is an independent directory and is not a dealer for, nor affiliated with, either manufacturer. Model and brand names are the trademarks of their owners.