Head to head
Brian James C4 Blue vs Ifor Williams HB511
The Brian James C4 Blue is 305kg lighter empty. The Ifor Williams HB511 is rated 100kg heavier gross.
Last reviewed 13 September 2026
Key differences
- Unladen weight: the Ifor Williams HB511 weighs 305kg more empty.
- Gross weight: the Ifor Williams HB511 is rated 100kg heavier gross.
Specifications side by side
| Brian James C4 Blue | Ifor Williams HB511 | |
|---|---|---|
| Gross weight | 2,600kg | 2,700kg |
| Unladen weight | 695kg | 1,000kg |
| Bed length | 5.0m | - |
| Bed width | 2.0m | - |
| Internal length | - | 3.52m |
| Internal width | - | 1.79m |
| Brakes | - | Braked |
Sources: Brian James C4 Blue, Ifor Williams HB511. Figures vary by model year and options, so check with the supplier before you commit.
Buy or hire the C4 Blue if...
- you want one that is 305kg lighter empty
A twin-axle open car transporter built to carry one road or track car behind a family car or 4x4. Track-day drivers and small vehicle traders hire it for moving a single car without the cost of an enclosed trailer.
Full C4 Blue specifications →Buy or hire the HB511 if...
- you want one that is rated 100kg 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 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
Common questions
What is the difference between the Brian James C4 Blue and the Ifor Williams HB511?
The Brian James C4 Blue is 305kg lighter empty. The Ifor Williams HB511 is rated 100kg heavier gross. The Brian James C4 Blue is a twin-axle car transporter trailer; the Ifor Williams HB511 is a two-horse trailer, twin axle, wider body.
Which is lighter, the Brian James C4 Blue or the Ifor Williams HB511?
The Brian James C4 Blue. It is 305kg lighter empty than the Ifor Williams HB511.
Can I tow the Brian James C4 Blue 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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