Head to head
Ifor Williams HB403 vs Ifor Williams TT3621
The Ifor Williams TT3621 carries 1,677kg more and is rated 1.9 tonnes heavier gross. The Ifor Williams HB403 is 223kg lighter empty.
Last reviewed 13 September 2026
Key differences
- Payload: the Ifor Williams TT3621 carries 1,677kg more.
- Gross weight: the Ifor Williams TT3621 is rated 1.9 tonnes heavier gross.
- Internal width: the Ifor Williams TT3621 is 65cm (2ft) wider inside.
- Unladen weight: the Ifor Williams TT3621 weighs 223kg more empty.
- Internal length: the Ifor Williams TT3621 is 54cm (2ft) longer inside.
Specifications side by side
| Ifor Williams HB403 | Ifor Williams TT3621 | |
|---|---|---|
| Gross weight | 1600kg | 3500kg |
| Unladen weight | 767kg | 990kg (195/60R12C tyres) or 1000kg (185/70R13C tyres) |
| Payload | 833kg | 2510kg (195/60R12C) or 2500kg (185/70R13C) |
| Internal length | 3.08m | 3.62m / 11'9" |
| Internal width | 1.30m | 1.95m / 6'5" |
Sources: Ifor Williams HB403, Ifor Williams TT3621. Figures vary by model year and options, so check with the supplier before you commit.
Buy or hire the HB403 if...
- you want one that is 223kg lighter empty
The smallest trailer in the HB horsebox range, bought by owners of a single horse or a couple of ponies who want the lightest legal option that can still be towed by a mid-size car.
Listed by
- Horse Trailer Sales - Robertsbridge, Staplecross
- Barnwell Trailers Ltd - Peterborough, Oundle, Barnwell
Buy or hire the TT3621 if...
- you want one that carries 1,677kg more
- you want one that is rated 1.9 tonnes heavier gross
- you want one that is 65cm (2ft) wider inside
- you want one that is 54cm (2ft) longer inside
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 HB403 and the Ifor Williams TT3621?
The Ifor Williams TT3621 carries 1,677kg more and is rated 1.9 tonnes heavier gross. The Ifor Williams HB403 is 223kg lighter empty. The Ifor Williams HB403 is a a compact single-horse or two-pony horsebox trailer; the Ifor Williams TT3621 is a twin axle tipping trailer, 12ft body, electric tipping.
Which is lighter, the Ifor Williams HB403 or the Ifor Williams TT3621?
The Ifor Williams HB403. It is 223kg lighter empty than the Ifor Williams TT3621.
Which carries more, the Ifor Williams HB403 or the Ifor Williams TT3621?
The Ifor Williams TT3621, by 1,677kg.
Can I tow the Ifor Williams HB403 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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