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But there's more accom options once you get to the east coast so it's probably less necessary to sleep rough.
I actually found that there were better accomodation options in the Nullarbor than elsewhere!
Apart from the cities most the route is still remote, on a weekday the Coorong is quieter than the Nullarbor, and riders from last year who did the full route said they saw fewer people on the inland bits between the climbs than the Nullarbor.
The other problem is that stuff closes early. In the little towns you can't count on rocking up at a hotel after 8pm, even if you have a reservation, and getting in. Midnight - no chance. In the Nullarbor what places there are at least stay open decent hours!
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I haven't actually looked at the route much, just knew it hit Radelaide and Melburn so figured it'd have decent towns in between. Sounds same as TABR then. You need to call before like 8pm or something to secure something miles down the road.
Did you consider the caravan parks at all or just hotel, motel stuff?
I had a "nice" kip in a campsite toilet/shower blocks near Blue Ridge Parkway.
But there's more accom options once you get to the east coast so it's probably less necessary to sleep rough.
I think it's mostly above zero, even in the mountains at the moment.