The same for rural Australia. There are certain areas that are simply open land with limited infrastructure - meaning there is no need to have a lot of firefighting vehicles located there (which wouldn't be possible anyway, as you need people to be in the trucks. And there are few people...
).
So if you were to base 1 fire station somewhere, it might start generating calls that need a lot of resources. Like suggested above - the first truck may get there quickly, but then it's a huge waiting game for the remaining units.
I don't see how this could be exploited, as we simply want it to be more realistic in what calls it generates. Maybe even a little setting on the station edit screen that says 'rural station', which you can tick?
This would then allow the station to only spawn missions with the need for only 1 or two trucks.
We understand that this is a game, but having a way to more appropriately spawn missions would get the support of a lot of players.