sorry i cant help with a workshop manual, though i think i do remember see them for sale at swapmeets. there is a guy who specialises in workshop manuals, i think he is from northern nsw and he travells around to swap meets. pretty sure thats where i seen it.
i used to drive one of those old toyota trucks in the early `90s . when i worked for Integral Energy in central NSW we had one with a pole jinker on it that we used for carrying the power poles from the depot out to location. it was an easy old thing to drive except for the fumes from all the oil leaks on the engine and it was very noisy.
thats what i got my truck licence in .