Living in the scrub..... I have a few basics as I am on bush roads all the time. Obviously you will have a set of sockets (metric) and a set of ring spanners. Set of Jumper leads, Spare fuel filters (never know when you'll get dodgy fuel). Tubeless tyre repair kit and compressor. I have driven thousands of rough K's on plugs.... not just one either... 3 or four at times. I think my best was Seven out cattle mustering beyond Meekatharra.... But a must have! Fuses....... a bit of electrical wire and cutters and crimpers. Multimeter... just an inexpensive one.... they are invaluable for solving problems... you just need to learn the basics. Continuum, (checking fuses) , voltage charge etc. A good 4 way wheel brace and a small trolley jack. Jacks in toyotas are pieces of crap, they wont even get under the axle if you have a rear flat. Toyotas answer is put a rock under the wheel and drive up on it...... (real good if you are in the great sandy desert or on the beach). A strong block of wood or metal, just in case you need a base to stop the jack sinking. CRC or WD40. UHF radios are also a must... outback anyway.... each station has its own uhf channel.... (no phone reception) Even on the road a uhf can tell you problems far in advance like flooded roads, accidents, Police road blocks etc... Toyotas are a magnicent piece of machineary, tough, rugged and reliable. Only thing that comes close are Suzukis... by crikey there is just about nowhere those little buggers won't go... but horses for coarses... Enjoy your trip.. whenever you may be allowed out to play.....