Hey Nicholas,
If the community are on a homestead, or at a ranger station, there will generally be access to basic showers.
With the mobile shower solution, this is more targeted towards remote camp sites/sites under development, and for when community are away from their main bases for days at a time.
Where there isn’t a shower, folks would be using creeks/rivers (where safe to do so and away from crocodiles), or going without until at camp.
Luke