Please see below the Trophy Karts aka Off Road Karts CAMS Standing Regulations.
http://docs.cams.com.au/Manual/OffRoad/OR08-OffRoadKart-Standing%20Regulations-2016-1.pdf
http://docs.cams.com.au/Regulations/Bulletins/2016%20Bulletins/B16-011%20Off-Road%20-%20Specific%20Requirements%20for%20Off%20Road%20Vehicles%20-%20Off%20Road%20Karts.pdf
http://docs.cams.com.au/Manual/OffRoad/OR08-OffRoadKart-Standing%20Regulations-2016-1.pdf
http://docs.cams.com.au/Regulations/Bulletins/2016%20Bulletins/B16-011%20Off-Road%20-%20Specific%20Requirements%20for%20Off%20Road%20Vehicles%20-%20Off%20Road%20Karts.pdf