Head to head
Ifor Williams CT166 vs Ifor Williams HB403
The Ifor Williams CT166 carries 1,782kg more and is rated 1.9 tonnes heavier gross. The Ifor Williams HB403 is 118kg lighter empty.
Last reviewed 13 September 2026
Key differences
- Payload: the Ifor Williams CT166 carries 1,782kg more.
- Gross weight: the Ifor Williams CT166 is rated 1.9 tonnes heavier gross.
- Unladen weight: the Ifor Williams CT166 weighs 118kg more empty.
Specifications side by side
| Ifor Williams CT166 | Ifor Williams HB403 | |
|---|---|---|
| Gross weight | 3500kg | 1600kg |
| Unladen weight | 885kg | 767kg |
| Payload | 2615kg | 833kg |
| Internal bed | 4.87m x 1.90m | - |
| Internal length | - | 3.08m |
| Internal width | - | 1.30m |
Sources: Ifor Williams CT166, Ifor Williams HB403. Figures vary by model year and options, so check with the supplier before you commit.
Buy or hire the CT166 if...
- you want one that carries 1,782kg more
- you want one that is rated 1.9 tonnes heavier gross
Bought by garages, recovery operators and plant hire firms who load low vehicles or compact machinery by tilting the deck to ground level instead of driving up loading ramps. The narrower CT166 bed suits standard cars and single machines.
Listed by
- Blains Trailers & Tyres - Hemel Hempstead, Great Gaddesden
Buy or hire the HB403 if...
- you want one that is 118kg 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
Common questions
What is the difference between the Ifor Williams CT166 and the Ifor Williams HB403?
The Ifor Williams CT166 carries 1,782kg more and is rated 1.9 tonnes heavier gross. The Ifor Williams HB403 is 118kg lighter empty. The Ifor Williams CT166 is a a tilt-bed car and machinery transporter trailer; the Ifor Williams HB403 is a a compact single-horse or two-pony horsebox trailer.
Which is lighter, the Ifor Williams CT166 or the Ifor Williams HB403?
The Ifor Williams HB403. It is 118kg lighter empty than the Ifor Williams CT166.
Which carries more, the Ifor Williams CT166 or the Ifor Williams HB403?
The Ifor Williams CT166, by 1,782kg.
Can I tow the Ifor Williams CT166 or the Ifor Williams HB403 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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