Have you considered the height of the towball?
When you measure the nose weight of the caravan presumably it is sitting level on its twin axles. In this condition, measure the hitch height and compare it to the car. And perhaps set the caravan hitch height to that of the car's towball unloaded and then measure the noseweight. I'd imagine a twin axle caravan could exert a much increased noseweight until it finds its level.
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