Head to head
Ifor Williams HB510XL vs Ifor Williams P5
The Ifor Williams P5 is 1,149kg lighter empty. The Ifor Williams HB510XL is rated 3 tonnes heavier gross and carries 1,851kg more.
Last reviewed 13 September 2026
Key differences
- Unladen weight: the Ifor Williams HB510XL weighs 1,149kg more empty.
- Gross weight: the Ifor Williams HB510XL is rated 3 tonnes heavier gross.
- Payload: the Ifor Williams HB510XL carries 1,851kg more.
Specifications side by side
| Ifor Williams HB510XL | Ifor Williams P5 | |
|---|---|---|
| Gross weight | 3500kg | 500kg |
| Unladen weight | 1290kg | 141kg |
| Payload | 2210kg | 359kg |
| Internal length | 4.25m | - |
| Internal width | 1.74m | - |
| Internal bed | - | 1.53m x 1.02m |
| Brakes | - | Unbraked |
Sources: Ifor Williams HB510XL, Ifor Williams P5. Figures vary by model year and options, so check with the supplier before you commit.
Buy or hire the HB510XL if...
- you want one that is rated 3 tonnes heavier gross
- you want one that carries 1,851kg more
For owners of taller or longer horses who find the standard HB511 too tight, giving extra internal length on the same 3500kg chassis so it stays towable by a suitably rated 4x4.
Listed by
- Horse Trailer Sales - Robertsbridge, Staplecross
Buy or hire the P5 if...
- you want one that is 1,149kg lighter empty
A light general-purpose trailer for domestic buyers moving garden waste, small loads or a mower, chosen for its low unladen weight so it can be towed by almost any car.
Listed by
- Blains Trailers & Tyres - Hemel Hempstead, Great Gaddesden
Common questions
What is the difference between the Ifor Williams HB510XL and the Ifor Williams P5?
The Ifor Williams P5 is 1,149kg lighter empty. The Ifor Williams HB510XL is rated 3 tonnes heavier gross and carries 1,851kg more. The Ifor Williams HB510XL is a an extra-length double horsebox trailer; the Ifor Williams P5 is a the smallest unbraked domestic trailer Ifor Williams makes.
Which is lighter, the Ifor Williams HB510XL or the Ifor Williams P5?
The Ifor Williams P5. It is 1,149kg lighter empty than the Ifor Williams HB510XL.
Which carries more, the Ifor Williams HB510XL or the Ifor Williams P5?
The Ifor Williams HB510XL, by 1,851kg.
Can I tow the Ifor Williams HB510XL or the Ifor Williams P5 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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