Like mentioned earlier, it sounds like system status management. It's a way for the service to get the most coverage and productivity,as in most calls per unit, and also needing less units posted in a particular coverage area. If the traditional method is to dispatch from stations, then SSM is a way to use less units to provide the same response times. In effect, there aren't any slow or busy rigs, since crews are repositioned constantly to fill areas devoid of coverage at the moment.
This type of system is desireable for someone wanting a high call volume. However, it's only appropriate for shifts of 16 hours or less. My opinion on 24 hour shifts is that the call volume for such a shift ought to allow for several hours of sleep, asy at least 3-4 at a minimum (broken or consecutive), for the back 10 hours of the shift. Otherwise, the shifts in that area ought to be 8 or 12 hours, 16 tops. You may desire a busy unit, but this may change after you get 5, 7, 10 years or more on the job. When you're working at night, you're constantly getting moved to cover other areas, and then getting calls. If there was no need to be repositioned at night, then there would be no need for SSM, since there would be enough crews to handle the volume without having to get creative.
SSM is likely to burn you out in the long term, as you'll be busy most of the time, as you can't transfer to a slow unit when you're tenured. Also ask yourself why your service needs to operate this way instead of putting out the proper amount of units. It may be a budget thing. If it is, you won't make a whole lot working there, and may want to seek employment in more affluent areas. Don't confuse an "effective system" with one that has desireable working conditions. The two terms aren't necessarily interchangeable.
Dispatching out of a station is the most desireable, as you have furniture, beds, showers, maybe a computer, TV, microwave, possibly a grill, stove and oven. You can plan meals, but also store things you can microwave quickly.
In NYC we sit on street corners. It's cool because you can roam the area a little and buff good jobs. But, there's no beds. I would take a sheet and cover the cot. I would then pad the head, rails, and foot with blankets. Then I would turn the AC up, and sleep like a baby. If you're in the front, buy a pair of dark sunglasses, so if a supervisor rolls up on you they can't say that you were sleeping, and if they take pictures of you they still can't prove anything. If they ask why you're wearing sunglasses, tell them that you suffer from frequent headaches or something. If you're in the back, I like to wear a perp hat (skully) and pull it over my eyes to block out the light. It goes along with the AC. Not as good as having a station to post at, but if you're on the edge of the city, or in a wealthy area, you'll be on a slow cabulance.