Charlie,
I think in stock form, with an original type hitch the FC in general would fail when towing 2 ton of weight.
In my humble opinion, probably a 3/4 chassis would be required for added strength and reduction of torsional twist.
In addition to this a sturdier mounting system for the towbar would have to be made, as the original uses the bumper mounts which are basically just nutserts.
Probably bolting through the rear subrame using anti crush tubes and much larger spreader plates would be better (im still unsure if it could take 2000kg down a bumpy winding road under brakes). If you could successfully spread the weight over a larger part of the rear subframe, that would be a step in the right direction I guess...
perhaps a wagon body on 4WD chassis ala Overlander?
Cheers
Ed