Great you are doing this trip Simon , you wont regret it .
I did a 5 week leisurely drive from Darwin to Perth here at the end of last year and its a trip I wont ever forget , just an awesome ( HUGE!) continent this Austrialia is
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One stand out was 3 days and 3 nights spent at 'Wolf Creek' crater , eerie spot , super dark and I did not see a soul in the time I spent there ,, cool place .
Anyway mate I used my Takahashi sky90 on Vixen SP mount as my main scope on this trip , over 5000km's .
The mount , counter weights , hand controller and other bits fit in one alloy case from Jaycar you know , the 400x400x129mm jobby's with the Tak OTA with finder and diagonal fitted , battery and eyepieces in another , these take up minimal room together .
The tripod lives with the camping gear,
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Enjoy the trip , if I was you a $500 60mm f7 Long Perng triplet's from Andrews on a sturdy photographic tripod would fit your bill well as you don't need big aperture when visiting some of the darkest places on the planet , I could see M31 ( Andromeda Galaxy ) naked eye from wolf creek .
Enjoy the trip/holiday .
Brian.