Over-run brakes on trailers require the vehicle to decelerate so that the brakes will activate, there is no control for the trailer brakes in the cabin - so the trailer can push the vehicle around a bit compared to electric brakes in certain circumstances. I imagine this is why they've specified trailers with that particular type of brakes as having an off road towing weight restriction.
Personally I tow a little old van with over-run brakes that weighs a fair bit more than the specified 1,000kgs in various conditions so this is an interesting conversation to me. I suppose defining the nebulous term "off road" is the key issue. Does it have a common meaning ? A legal meaning ? A meaning for insurance purposes ? A meaning according to the situation in question ? I'm not sure really.


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