GVW is set so that cars have designated carrying capacity. This is 15.5cwt for utes, 14.5cwt for vans and 10cwt for those with passenger tyres. 1 x cwt is about 50kg so that gives you 775kg, 725kg and 500kg respectively. The GVW is the weight of the vehicle plus the load, so thet GVW is set to suit. I haven't fully solved the 1800kg v 1860kg in HJ/HX utes yet (I think it is an A/C thing) but one day I will. I now know why reduced GVW was introduced but i'll keep this one for the book (makes no difference to helping ID so a secret I can keep for now).