Hello,
In Australia we have the concept of a community fire unit, like these: 
Some are static structures, some are on trailers.
I’m struggling to find the right tags for it, as Fire Station is more for a building while emergency/fire_extinguisher is doesn’t cover it fully.
What is wisdom here?
Edwin
HI and welcome to OSM and the forum
https://wiki.openstreetmap.org/wiki/Key:emergency#Firefighters looks like the best category in my opinion. Currently there is no tag for a facility shown in the picture. I’d suggest to establish something like emergency=fire_equipment. If you describe this new tag on the wiki-page other mappers might start to use it as well.
Maybe you can use man_made=street_cabinet + street_cabinet=* together with an appropriate emergency=* tag.
I don’t know why emergency=fire_point_stand is put on the list with only 9 instances and an unclear status.
What about using building=static_caravan / cabinet or as emergency-cabinet ?
But put it the Australien Fora just to reach some agreement over it.