Everyone keeps saying GVW, but remember Sandman has no different GVW to a normal ute or van (2155kg 6cyl, 2200kg V8), it never did (XX7 up until 10/75 then XU3). It is only if the post 10/75 Sandman is optioned with passenger tyres that the GVW gets de-rated (XX7 post 10/75), BUT this was available across the board on HJ, HX and HZ vans and utes, not just Sandman AND only on 1978 and 1979 HZ does the XX7 Sandman get a unique GVW. For HJ and HX it is the same for XX7 and XU4. So a lower GVW is just like interior light door switches, it was optional on all HX HOLDEN utes and vans.