ha ha,,,Brisbane to Melbourne & back quite a few times now,,,not to mention (i don`t know how many) trips to Syd & back to bris,,,umpteen times
a couple of times we did bris --> syd & back in a moke,,,one of them without wipers & guess who had to sit out the side of the moke & hand opperate the wipers with string attached,,, in the middle of the night, fogged out like a white out, freezing my tits off ???,,,yeah!!!,,,never again tho
I would rather drive long distances in a mini tho (well,,,as long as it had major grunt ,ok ok, i am a bit power spoilt), i am more comfortable in a mini than anything else tho, been in them that long that i think my body has formed the shape of the mini seat
try brisbane to Tasmania & back in an old split window combie ute with the race mini on the back of the tray & all the rally gear & camping gear & all the tools & equipment & a complete spare front & rear suspension assys & also a complete spare power unit & & & ...Hell YeaH!!!!!!!!!!!!!!!!!!!!!! the dam thing was on the bump stops the whole way there & back...never again

but then, i do have a photo of the speedo doin 75mph with all that crap in the dam thing
Minis are fine on long trips,,,as long as they have been prepared & maintained well, shouldn`t be a problem driving them around Australia a few times.