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Perhaps just a stronger casing/flanges for the additional weight, rather than internals?
Did you kill the hub or just the 3-pawls freewheel?
Vince-
The gear internals, the freewheel was fine. Seems the common failure from forums – the hub seizes and cant shift gear, as well as slipping internally (not freehub) and extreme friction when coasting.
FWIW Replacement wheel was £450, with 2 year warranty. I also bought breakdown cover for cargo bikes from ETA (£24) so I don't have to worry too much if it fails again.
cmyj
Any ideas on the key differences from Heavy Duty to Extreme? Looks like it can only take the same amount of torque, which I think is the weak point – I just killed a Enviolo Cargo hub after only 600 miles in a hilly area carrying two kids. Perhaps just a stronger casing/flanges for the additional weight, rather than internals?
I've just had the new Heavy Duty wheel built to replace the old Cargo hub which has a different case too, and hopefully uprated internals.