Having some farm fire fighting units is a good idea...but in many areas, that is proving very difficult.
In many rural communities, each farm would have its own farm unit - so in the event of a fire, there were many useful farm units, able to assist.
However, with the drought in the last few years, many of the farms have been sold to large companies, who have the funds to buy up the farm, ride out the drought, and then make a packet with the farm producing again.
In the mean time, instead of having one fire unit per farm, there are perhaps one or two caretakers / overseers for 10 farms....thereby reducing the number of available units.....
Pip