Head to head
Ifor Williams HB511 vs Stewart GX16-21 L
The Ifor Williams HB511 is 4.5 tonnes lighter empty.
Last reviewed 13 September 2026
Key differences
- Unladen weight: the Stewart GX16-21 L weighs 4.5 tonnes more empty.
Specifications side by side
| Ifor Williams HB511 | Stewart GX16-21 L | |
|---|---|---|
| Unladen weight | 1,000kg | 5,500kg |
| Gross weight | 2,700kg | - |
| Internal length | 3.52m | - |
| Internal width | 1.79m | - |
| Brakes | Braked | - |
| Carrying capacity | - | 16,000kg |
| Cubic capacity | - | grain 21m3, silage 37m3 |
| Body | - | 6700 x 2450 x 1370mm |
Sources: Ifor Williams HB511, Stewart GX16-21 L. Figures vary by model year and options, so check with the supplier before you commit.
Buy or hire the HB511 if...
- you want one that is 4.5 tonnes lighter empty
The wider step up from the HB506, for larger horses or owners who want more room in transit. The extra 12cm of internal width and 36cm of length cost 80kg unladen, which is worth checking against your tow vehicle before choosing it over the HB506.
Listed by
- Trek-Trailers Suffolk - Bury Saint Edmunds
- R M Trailer Centre - Middlesbrough, North Ormesby
- Blains Trailers & Tyres - Hemel Hempstead, Great Gaddesden
- Horse Trailer Sales - Robertsbridge, Staplecross
- Trek-Trailers Three Counties - Hereford
- Barnwell Trailers Ltd - Peterborough, Oundle, Barnwell
Buy or hire the GX16-21 L if...
A large bulk trailer used to cart grain and root crops at harvest, with an easy sheet system to cover the load without climbing on top. Farmers hire extra units like this at harvest to move crop faster than their own trailers allow.
Listed by
- Rising Sun Trailer Hire - York
Common questions
What is the difference between the Ifor Williams HB511 and the Stewart GX16-21 L?
The Ifor Williams HB511 is 4.5 tonnes lighter empty. The Ifor Williams HB511 is a two-horse trailer, twin axle, wider body; the Stewart GX16-21 L is a bulk agricultural trailer with easy sheet cover.
Which is lighter, the Ifor Williams HB511 or the Stewart GX16-21 L?
The Ifor Williams HB511. It is 4.5 tonnes lighter empty than the Stewart GX16-21 L.
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