Head to head
Bockmann Portax K vs Ifor Williams HB511
The Ifor Williams HB511 is rated 300kg heavier gross and is 4cm wider inside. The Bockmann Portax K is 4cm longer inside.
Last reviewed 13 September 2026
Key differences
- Gross weight: the Ifor Williams HB511 is rated 300kg heavier gross.
- Internal width: the Ifor Williams HB511 is 4cm wider inside.
- Internal length: the Bockmann Portax K is 4cm longer inside.
Specifications side by side
| Bockmann Portax K | Ifor Williams HB511 | |
|---|---|---|
| Gross weight | 2400kg | 2,700kg |
| Internal length | 3560mm | 3.52m |
| Internal width | 1750mm | 1.79m |
| Payload | 1265kg | - |
| Internal height | 2350mm | - |
| Unladen weight | - | 1,000kg |
| Brakes | - | Braked |
Sources: Bockmann Portax K, Ifor Williams HB511. Figures vary by model year and options, so check with the supplier before you commit.
Buy or hire the Portax K if...
- you want one that is 4cm longer inside
A mid-range Portax with a front unloading ramp, bought by owners who value being able to lead a horse out the front rather than reversing it out. It sits below the Big Portax models in size and price.
Listed by
- Böckmann UK Trailers & Horseboxes - Cinderford, Littledean
Buy or hire the HB511 if...
- you want one that is rated 300kg heavier gross
- you want one that is 4cm wider inside
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 Lincolnshire - Doncaster, Belton
- 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
Common questions
What is the difference between the Bockmann Portax K and the Ifor Williams HB511?
The Ifor Williams HB511 is rated 300kg heavier gross and is 4cm wider inside. The Bockmann Portax K is 4cm longer inside. The Bockmann Portax K is a aluminium 2-horse trailer with front exit; the Ifor Williams HB511 is a two-horse trailer, twin axle, wider body.
Can I tow the Bockmann Portax K or the Ifor Williams HB511 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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