I have the black airbags in the back of my ute, and like the adjustment for the load of using them. If you have the ute loaded 100% of the time, with a fairly constant weight, then go for the ungraded leaf springs. In NSW, upgrading the springs still doesn't increase the GVM. That is still the same as the std. ute. In NSW again, the tyre has to have the load rating as well. TAS seems to have more sensible rules than NSW. But that's no suprise.