Woomera is an army base. Coober Pedy is a frontier opal mining town where most people live underground to escape the hot weather. Coober Pedy is very different and unlike any other town. It caters for tourists and is worth staying overnight. Otherwise there are also roadhouses every 200km or so.
Roadhouses have petrol, food, accomodation and basic vehicle repairs available.
The region is hot dry and arid. It is extremely remote as soon as you leave bitumen Stuart Highway. Do not drive your vehicle on remote gravel tracks without notifying authorities and taking proper precautions. The road from Port Augusta to beyond Coober Pedy passes through a treeless waterless landscape. There is only red earth between evenly spaced salt bush and a few salt lakes.