Essentially there was a need for vehicles with carrying capacity less than 500kg. So GMH modified the Sandman and created 2 x Sandman options, lineage as below:
Sandman: Essentially 1/74 through to 10/75 - coded XX7, 10/75 through to 10/79 - coded XU3. These all have commercial tyres and full GVW.
Derated Sandman: 10/75 through to 10/79 - coded XX7. These have passenger tyres.
The XU4 option is the same principle but applied to a normal ute or van or Kingswood ute, ie passenger tyres fitted to lower the carrying capacity. 10/75 through to the end of WB. XU4 is tyres only, and GVW reduced accordingly. Nothing else.
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