Vehicle contents shipping insurance
 

We are finally ready to book our Unimog onto a RoRo to Durban.
While I'm happy that I can find a shipping agent who can get the passage, what I can't seem to find is satisfactory marine insurance.
Every policy offered so far is basically on a "total loss basis" for contents (ie contents are only covered if the entire vehicle is lost overboard) - and by contents it doesn't only mean things that aren't fastened down, it means absolutely everything (I'm imagining the vehicle having been pilfered in a port somewhere with literally thousands of pounds of fittings having been removed, then the insurance company denying any liability).

So - has anyone found a policy that covers not only the vehicle, but everything that travels inside it?
Any help would be much appreciated!

Ian