I understand that for towing more drive is sent to the rear wheels when you connect the tow bar electrics. I dont know the exact % but the exct same system is used in the modern 4 motion system that volkswagen and Audi use.This haldex system is used in most 4x4 vehicles most sucessfully in the freelander. The reason its so good off-road is that it is biased to 4x4 upon take off and doesnt wait for a wheel to slip to engage.
Therfore you dont get stuck in the first place.
I have not tested the theory but after last winter intend to keep a trailer board in the boot as the whole waiting on a wheel to slip is a joke on ice and snow.
The computer just thinks you are driving and does hee haw to help you. By which time your wheels are now on sheet ice.
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