Head to head
Ifor Williams HB511 vs Ifor Williams TT3621
The Ifor Williams TT3621 is rated 800kg heavier gross and is 16cm wider inside.
Last reviewed 13 September 2026
Key differences
- Gross weight: the Ifor Williams TT3621 is rated 800kg heavier gross.
- Internal width: the Ifor Williams TT3621 is 16cm wider inside.
- Internal length: the Ifor Williams TT3621 is 10cm longer inside.
- Unladen weight: the Ifor Williams HB511 weighs 10kg more empty.
Specifications side by side
| Ifor Williams HB511 | Ifor Williams TT3621 | |
|---|---|---|
| Gross weight | 2,700kg | 3500kg |
| Unladen weight | 1,000kg | 990kg (195/60R12C tyres) or 1000kg (185/70R13C tyres) |
| Internal length | 3.52m | 3.62m / 11'9" |
| Internal width | 1.79m | 1.95m / 6'5" |
| Brakes | Braked | - |
| Payload | - | 2510kg (195/60R12C) or 2500kg (185/70R13C) |
Sources: Ifor Williams HB511, Ifor Williams TT3621. Figures vary by model year and options, so check with the supplier before you commit.
Buy or hire the HB511 if...
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
Buy or hire the TT3621 if...
- you want one that is rated 800kg heavier gross
- you want one that is 16cm wider inside
- you want one that is 10cm longer inside
- you want one that is 10kg lighter empty
The largest Ifor Williams tipper. A 3.6m by 1.95m body is chosen for bulky, lighter loads - green waste, clearance and bark - where volume runs out before weight does, and it is a staple of plant and tool hire fleets. Formerly sold as the TT126.
Listed by
- Barnwell Trailers Ltd - Peterborough, Oundle, Barnwell
Common questions
What is the difference between the Ifor Williams HB511 and the Ifor Williams TT3621?
The Ifor Williams TT3621 is rated 800kg heavier gross and is 16cm wider inside. The Ifor Williams HB511 is a two-horse trailer, twin axle, wider body; the Ifor Williams TT3621 is a twin axle tipping trailer, 12ft body, electric tipping.
Which is lighter, the Ifor Williams HB511 or the Ifor Williams TT3621?
The Ifor Williams TT3621. It is 10kg lighter empty than the Ifor Williams HB511.
Can I tow the Ifor Williams HB511 or the Ifor Williams TT3621 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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