Yes, its a great idea, i would really enjoy playing this mod, i just got a few ideas for you if your interested, One of your engines could maybe be a telesquirt like a KME 55' Fire Stix considering you dont have a ladder truck, this could give you engine and truck operations in the same rig. Also maybe think of the brush as a mini pumper or wildland interface so you could also have a light duty rescue. Since your most likely rural, your pd should have a 4x4 unit like an suv or pickup and also include some swat settings in it like a shotgun or AR-15 and also have a bullet proof vest setting. you could also go and add a small mutual aid department on a forest rd in a corner of the map with a older model engine like a commercial cab KME and 80's military pickup style brush. Since your a vol. department, you might want the ambulance(s) max 2 in the fire station and if they are BLS like in most rural areas, you should prob include 1 chase truck medic unit at the hospital with 2 medics in it so that the unit could operate on a split capable status. Lastly you might want to add the department of forestry or as its known in pennsylvania and surrounding states DCNR for brush, tanker ,and air support. Like I said just a few ideas but maybe it could help your gameplay out in the long run.