Whilst i appreciate that, I am playing to create a realistic set-up and am not hugely fussed if they are not used as a required unit. They are still helpful and I look forward to the Ambulance expansion which allows them to be used more widely. Furthermore - they are already in-game and available at ambulance stations, thus my request to allow them to be based at fire stations with amb expansions does not seem that unwarranted to me.
This is why i'd like to see RRV possibility to add for HEMS bases...