Hi i just drove sydney to Broome and back in a series 90 Prado 3 lt diesel which was about 16000 kms round trip on some of the roughest sh@t tracks up to Kalumbaru and around the gulf country that i have had the pleasure of driving on. I towed a 7 x 4 box trailer which i built a canopy on and was set up to sleep in and carry 2 mountain bikes as well as all sorts of essential fun gear, boards etc.
The prado cost $14000 and was fantastic, climbs hills and does deep beach sand easily with no over heating or other issues, and really at the end of the day you are more limited by your choice of tyres than anything. At that price it should be fully fitted to go off road with bull bar and all the goodies.
Dont worry about high Kms around 200,000 but check service history thoroughly.
I have carried a 9.6 foot board inside, when i had to and at the price who cares if it gets a bit dirty and scratched.
around 9-10 lts per 100 kms highway a bit less economy in dirt. The 140 ltr fuel tank gives you all the range you ever need well over 1000 kms plus no matter how you drive.
They appear a bit agricultural next to an FJ but at the price you can fit them out with sat nav and a great stereo and you are good to go.
If you look at one just be aware that the head may need doing at around 230,000 kms allow $5000. Mine was already done and had all reciepts.
Really any of the prados in the last 12 years are good.
Any way Good luck with the FJ if you get one they look a bit small and fancy for my liking.