I have not heard of filling the rear tank with sand either but it could well be something that was done without sanction from above. Did they really fill the tank itself or remove the tank and fill the armour box, which would have been much easier and quicker.
British tanks continued to use dry pin track though with replaceable rubber pads on Chieftain and even Challenger 1 but Challenger 2 finally got live track similar to Leopard.
David
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