Head to head
Ifor Williams HB510XL vs Stewart GX16-21 L
The Ifor Williams HB510XL is 4,210kg lighter empty.
Last reviewed 13 September 2026
Key differences
- Unladen weight: the Stewart GX16-21 L weighs 4,210kg more empty.
Specifications side by side
| Ifor Williams HB510XL | Stewart GX16-21 L | |
|---|---|---|
| Unladen weight | 1290kg | 5,500kg |
| Gross weight | 3500kg | - |
| Payload | 2210kg | - |
| Internal length | 4.25m | - |
| Internal width | 1.74m | - |
| Carrying capacity | - | 16,000kg |
| Cubic capacity | - | grain 21m3, silage 37m3 |
| Body | - | 6700 x 2450 x 1370mm |
Sources: Ifor Williams HB510XL, Stewart GX16-21 L. Figures vary by model year and options, so check with the supplier before you commit.
Buy or hire the HB510XL if...
- you want one that is 4,210kg lighter empty
For owners of taller or longer horses who find the standard HB511 too tight, giving extra internal length on the same 3500kg chassis so it stays towable by a suitably rated 4x4.
Listed by
- Horse Trailer Sales - Robertsbridge, Staplecross
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 HB510XL and the Stewart GX16-21 L?
The Ifor Williams HB510XL is 4,210kg lighter empty. The Ifor Williams HB510XL is a an extra-length double horsebox trailer; the Stewart GX16-21 L is a bulk agricultural trailer with easy sheet cover.
Which is lighter, the Ifor Williams HB510XL or the Stewart GX16-21 L?
The Ifor Williams HB510XL. It is 4,210kg lighter empty than the Stewart GX16-21 L.
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