Head to head
Anssems GT500-151 vs Ifor Williams HB403
The Ifor Williams HB403 is rated 1.1 tonnes heavier gross.
Last reviewed 13 September 2026
Key differences
- Gross weight: the Ifor Williams HB403 is rated 1.1 tonnes heavier gross.
Specifications side by side
| Anssems GT500-151 | Ifor Williams HB403 | |
|---|---|---|
| Gross weight | 500kg | 1600kg |
| Internal dimensions | 151cm x 101cm x 48cm | - |
| Unladen weight | - | 767kg |
| Payload | - | 833kg |
| Internal length | - | 3.08m |
| Internal width | - | 1.30m |
Sources: Anssems GT500-151, Ifor Williams HB403. Figures vary by model year and options, so check with the supplier before you commit.
Buy or hire the GT500-151 if...
A light trailer for camping gear, luggage and small DIY loads, towable behind almost any car. The hard-top version is the one most buyers want, because weatherproof and lockable is the whole reason to choose this over a builders trailer.
Full GT500-151 specifications →Buy or hire the HB403 if...
- you want one that is rated 1.1 tonnes heavier gross
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 Anssems GT500-151 and the Ifor Williams HB403?
The Ifor Williams HB403 is rated 1.1 tonnes heavier gross. The Anssems GT500-151 is a small single-axle luggage and general purpose trailer; the Ifor Williams HB403 is a a compact single-horse or two-pony horsebox trailer.
Can I tow the Anssems GT500-151 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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