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Found four class g duty 3d models.

free
grabcad
FMI "QDX" Hazardous-Duty Pump
free
3dwarehouse
MSX XC8 3.2 TDI-6
free
3dwarehouse
MSX XC8 4.0 TDI-6 LWB
free
3dwarehouse
MSX XC8 302 S/C V8 dual cab