I flew across the Nullarbor and back to Melbourne in a Searey April 2024.
Cruises at 80 kts and 4 hours endurance. Head winds are a factor.
The road houses where fine. All Airstrips where ok.
Nullarbor has the best runway looks to be all weather.
Boarder airstrip is good. Landed on the cross runway on rtn. It is rough, the surface is ok a lot of weeds growing up.
Mundrabilla ok in places lots of weeds growing up. No fuel.
Caiguna Good surface flat. Airstrip, looks prone to flooding if raining.
Balladonia Good surface. Wide and long airstrip, great food and 98.