Model against model
Ifor Williams HB510XL vs Ifor Williams TT3621
Two models people put on the same shortlist. Every figure below is sourced, and where one side has a specification the other does not publish, the row is left out rather than filled with a guess.
Last reviewed 13 September 2026
| Ifor Williams HB510XL | Ifor Williams TT3621 | |
|---|---|---|
| Gross weight | 3500kg | 3500kg |
| Unladen weight | 1290kg | 990kg (195/60R12C tyres) or 1000kg (185/70R13C tyres) |
| Payload | 2210kg | 2510kg (195/60R12C) or 2500kg (185/70R13C) |
| Internal length | 4.25m | 3.62m / 11'9" |
| Internal width | 1.74m | 1.95m / 6'5" |
Only specifications published for both models appear here. Full Ifor Williams HB510XL figures and full Ifor Williams TT3621 figures.
Choose the HB510XL if...
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.
Full specifications →Choose the TT3621 if...
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.
Full specifications →Common questions
What is the difference between the Ifor Williams HB510XL and the Ifor Williams TT3621?
Ifor Williams HB510XL: 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. Ifor Williams TT3621: 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.
Are these figures reliable?
Every figure on this page was read off a manufacturer or established dealer page and is linked to its source. Anything we could not verify is left out rather than estimated. Specifications change by model year and configuration, so confirm with the supplier before relying on them.
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