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Power RV trailer requirements ?

535 1
I'm looking in to a special project.
I want to power a diff on a single axle 2 ton trailer towed by a 4x4 Mitsubishi Canter. The trailer may utilise a front diff out of the truck.
The trailer will only require drive when in difficult conditions. I expect that to be low range and low gears. Speed up to 10kph.
The trailer will have free wheeling hubs to disengage above 10kph.
The diff ratio is close to 6:1
What motor power and spec would achieve this result ?