Pack good tie downs.....to be sure, to be sure.
Adells have avgas, but cheaper at Burketown. Sweers can have softish sand patches .....can have.
Burke and Wills roadhouse....Undara lava tubes, both have good strips, food, accom etc.....both in the general areas you're heading.
Hells Gate, another place, accom etc......nothing special there, only to say, you've been there.
If you're going to Sweers, have a look at Birri resort...not far away on main island.
We're passing through same areas....again, same time as yourself, might bump into you.
Lastly, pack can of " surface spray " .....spray base of wheels, pegs, etc, overnighting....them mongrel ants move in reeeel quick.