Bone quite a few of troopys do overturn in the aussie outback,but its really a matter of driving,weight distrubution,tyre inflation and often alcahol
Also in remote areas LWB 75 series are well and truly over represented,distorting the stats,hell your not going to see a Honda CRV out there
The flywheel I would leave until it needs a new clutch ,giving you time to research it more.
A single piece flywheel is probably better but I too have not heard of the Patrol having trouble with their setup