Crikey Bill...you get around a bit m8.
Can't offer much advice other than keep the tyre pressures up 40+ so you minimise staking side walls.....don't know what rubber you have but I'd be lookin' at replacing the Wranglers if you still have them. No roos around weipa hey
, I'll be buggered...musta been eaten out m8....
I wouldn't be fiddling with motor. As far as longevity, always have plenty of grog around, oh and the usual......spare radiator hoses and water.
When you come across the flocks of major Mitchells and budgies sitting on the road ...... slow down....they are too stupid to move and will break your head lights, spotties, grille etc if you hit them at speed. The blood dries instantly on the hot metal and is a real pain in the ass to clean off.
hth's and good luck......and post up some pics from the area.
ps....you are deep in landcruiser territory.....keep a low profile...let them do all the skiting .......and let the Jeep do all the talking....that way you have nothing to lose, only they do.