MML Oil base tanker base transforming SBM from scomi yard to rig site while tanker was about? km. from rig site tanker king pin housing of file wheel broken and tanker separated from prime mover it steered off the road to nice paddy held and as nice paddy held is about 2 lower in lever compare to road tanker roller over on about 9 club meter SBM spilled in field driver is sa fe.