When I had my 2001 Ti GVM upgrade to 3550 kg done in 2018 here in QLD, the requirements were that the vehicle had to be diesel and had to have ABS. Mine is converted to TD42T from a TB45E but engineer said that didn't matter. The Ti model had ABS as standard.
I also had to fit Cat 6 side indicators because he was changing the vehicle category to Light Commercial. I think that's where the ABS requirement comes in.
I had to fit specific Tough Dog springs and shocks and 2 degree castor bushes. He was Ok with me doing all the work and he came to my home to inspect and sign off, fix blue mod plate, etc.
I told him I had already done the Boss rear coil tower reinforcing and he said that's a good idea but not required.
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