Head to head
Brian James A Transporter (A4) vs Ifor Williams HB511
The Ifor Williams HB511 is rated 700kg heavier gross.
Last reviewed 13 September 2026
Key differences
- Gross weight: the Ifor Williams HB511 is rated 700kg heavier gross.
Specifications side by side
| Brian James A Transporter (A4) | Ifor Williams HB511 | |
|---|---|---|
| Gross weight | 2,000kg to 3,000kg depending on variant | 2,700kg |
| Brakes | Braked, tandem axle | Braked |
| Bed | 3.7m x 1.8m up to 5.0m x 2.0m depending on variant | - |
| Unladen weight | - | 1,000kg |
| Internal length | - | 3.52m |
| Internal width | - | 1.79m |
Sources: Brian James A Transporter (A4), Ifor Williams HB511. Figures vary by model year and options, so check with the supplier before you commit.
Buy or hire the A Transporter (A4) if...
One of the most common car trailers in Britain, bought by trade and private owners for moving road cars, project cars and small vans. The reason it sells is the spread of bed length and gross weight combinations, which lets you match the trailer to the tow car rather than the other way round.
Listed by
- Fieldfare Trailer Centre - Salisbury
- Bicester Trailer Centre - Bicester
- Trek-Trailers Three Counties - Hereford
Buy or hire the HB511 if...
- you want one that is rated 700kg heavier gross
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 Brian James A Transporter (A4) and the Ifor Williams HB511?
The Ifor Williams HB511 is rated 700kg heavier gross. The Brian James A Transporter (A4) is a open flatbed car transporter, twin axle; the Ifor Williams HB511 is a two-horse trailer, twin axle, wider body.
Can I tow the Brian James A Transporter (A4) 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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